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Ji K, Liu W, Yin W, Kong X, Xu H, Lai ZW, Li JY, Yue JM. A new class of potent liver injury protective compounds: Structural elucidation, total synthesis and bioactivity study. Acta Pharm Sin B 2023; 13:3414-3424. [PMID: 37655332 PMCID: PMC10465957 DOI: 10.1016/j.apsb.2023.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 04/23/2023] [Accepted: 04/29/2023] [Indexed: 09/02/2023] Open
Abstract
A new class of potent liver injury protective compounds, phychetins A-D (1-4) featuring an unique 6/6/5/6/5 pentacyclic framework, were isolated and structurally characterized from a Chinese medicinal plant Phyllanthus franchetianus. Compounds 2-4 are three pairs of enantiomers that were initially obtained in a racemic manner, and were further separated by chiral HPLC preparation. Compounds 1-4 were proposed to be originated biosynthetically from a coexisting lignan via an intramolecular Friedel-Crafts reaction as the key step. A bioinspired total synthesis strategy was thus designated, and allowed the effective syntheses of compounds 2-4 in high yields. Some of compounds exhibited significant anti-inflammatory activities in vitro via suppressing the production of pro-inflammatory cytokine IL-1β. Notably, compound 4, the most active enantiomeric pair in vitro, displayed prominent potent protecting activity against liver injury at a low dose of 3 mg/kg in mice, which could serve as a promising lead for the development of acute liver injury therapeutic agent.
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Affiliation(s)
- Kailong Ji
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Wei Liu
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Weihang Yin
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Xiangrong Kong
- School of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Honghong Xu
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Zeng-Wei Lai
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Jing-Ya Li
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
- School of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Jian-Min Yue
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
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2
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Elberembally K. A new procedure for the synthesis of α-acyloxy aldehydes from ketones via α,β-epoxy sulfides. J Sulphur Chem 2015. [DOI: 10.1080/17415993.2015.1057823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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3
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Friedemann NM, Eustergerling A, Nubbemeyer U. New Optically Active 4-Alkoxyprolinol Ethers Derived from trans-4-Hydroxy-L-proline. European J Org Chem 2011. [DOI: 10.1002/ejoc.201101156] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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4
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Hiraga Y, Widianti T, Kunishi T, Abe M. The cooperative effect of a hydroxyl and carboxyl group on the catalytic ability of novel β-homoproline derivatives on direct asymmetric aldol reactions. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.01.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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5
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Lee SJ, Youn SH, Cho CW. Organocatalytic enantioselective formal synthesis of bromopyrrole alkaloids via aza-Michael addition. Org Biomol Chem 2011; 9:7734-41. [DOI: 10.1039/c1ob06078c] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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6
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Français A, Leyva-Pérez A, Etxebarria-Jardi G, Peña J, Ley SV. Total Synthesis of Iso- and Bongkrekic Acids: Natural Antibiotics Displaying Potent Antiapoptotic Properties. Chemistry 2010; 17:329-43. [DOI: 10.1002/chem.201002380] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Indexed: 11/05/2022]
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7
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Bernáth G. Fused-Skeleton Saturated Six-Membered 1,3-N,O, N,N and N,S Heterocycles. Fused-Skeleton Aryl-Substituted Saturated Isoindolones. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19941030903] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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8
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Tone H, Buchotte M, Mordant C, Guittet E, Ayad T, Ratovelomanana-Vidal V. Asymmetric Total Synthesis and Stereochemical Revision of Gymnangiamide. Org Lett 2009; 11:1995-7. [DOI: 10.1021/ol900184d] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hitoshi Tone
- Laboratoire Charles Friedel, ENSCP Chimie ParisTech, UMR 7223, 11 rue P. et M. Curie, F-75231 Paris Cedex 05, France, and Laboratoire de Chimie et Biologie Structurales, Institut de Chimie des Substances Naturelles, UPR 2301 91190 Gif-sur-Yvette, France
| | - Marie Buchotte
- Laboratoire Charles Friedel, ENSCP Chimie ParisTech, UMR 7223, 11 rue P. et M. Curie, F-75231 Paris Cedex 05, France, and Laboratoire de Chimie et Biologie Structurales, Institut de Chimie des Substances Naturelles, UPR 2301 91190 Gif-sur-Yvette, France
| | - Céline Mordant
- Laboratoire Charles Friedel, ENSCP Chimie ParisTech, UMR 7223, 11 rue P. et M. Curie, F-75231 Paris Cedex 05, France, and Laboratoire de Chimie et Biologie Structurales, Institut de Chimie des Substances Naturelles, UPR 2301 91190 Gif-sur-Yvette, France
| | - Eric Guittet
- Laboratoire Charles Friedel, ENSCP Chimie ParisTech, UMR 7223, 11 rue P. et M. Curie, F-75231 Paris Cedex 05, France, and Laboratoire de Chimie et Biologie Structurales, Institut de Chimie des Substances Naturelles, UPR 2301 91190 Gif-sur-Yvette, France
| | - Tahar Ayad
- Laboratoire Charles Friedel, ENSCP Chimie ParisTech, UMR 7223, 11 rue P. et M. Curie, F-75231 Paris Cedex 05, France, and Laboratoire de Chimie et Biologie Structurales, Institut de Chimie des Substances Naturelles, UPR 2301 91190 Gif-sur-Yvette, France
| | - Virginie Ratovelomanana-Vidal
- Laboratoire Charles Friedel, ENSCP Chimie ParisTech, UMR 7223, 11 rue P. et M. Curie, F-75231 Paris Cedex 05, France, and Laboratoire de Chimie et Biologie Structurales, Institut de Chimie des Substances Naturelles, UPR 2301 91190 Gif-sur-Yvette, France
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Ishikawa M, Ninomiya T, Akabane H, Kushida N, Tsujiuchi G, Ohyama M, Gomi S, Shito K, Murata T. Pseurotin A and its analogues as inhibitors of immunoglobulin E [correction of immunoglobuline E] production. Bioorg Med Chem Lett 2009; 19:1457-60. [PMID: 19179074 DOI: 10.1016/j.bmcl.2009.01.029] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2008] [Revised: 01/08/2009] [Accepted: 01/12/2009] [Indexed: 11/16/2022]
Abstract
A natural product, pseurotin A inhibits IgE production in vitro. Wide variety of chemical modification of pseurotin A was performed. Structure-activity relationship studies of pseurotin analogues elucidated that 10-deoxypseurotin A strongly inhibits IgE production with IC(50) of 0.066 microM. An immunosuppressive activity of another natural product, synerazol was also found.
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Affiliation(s)
- Minoru Ishikawa
- Pharmaceutical Research Center, Meiji Seika Kaisha, Ltd., 760 Morooka-cho, Kohoku-ku, Yokohama 222-8567, Japan
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Quezada E, Delogu G, Viña D, Santana L, Picciau C, Podda G, Uriarte E. Synthesis and complete assignment of the 1H and 13C NMR signals of some oxopyrancoumarin and oxofuropyrancoumarin derivatives. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2008; 46:701-705. [PMID: 18407569 DOI: 10.1002/mrc.2223] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The synthesis of four pyranocoumarins starting from phloroglucinol and the complete (1)H and (13)C NMR assignment of seven pyranocoumarins has been performed using 1D and 2D NMR techniques including COSY, HMQC and HMBC experiments.
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Affiliation(s)
- Elías Quezada
- Dipartimento Farmaco Chimico Tecnologico, Universita degli Studi di Cagliari, Via Ospedale 72, 09124 Cagliari, Italy.
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Bodkin JA, Bacskay GB, McLeod MD. The Sharpless asymmetric aminohydroxylation reaction: optimising ligand/substrate control of regioselectivity for the synthesis of 3- and 4-aminosugars. Org Biomol Chem 2008; 6:2544-53. [DOI: 10.1039/b803310b] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Paquette LA, Hu Y, Luxenburger A, Bishop RL. Studies toward the Total Synthesis of Dumsin. 2. A Second Generation Approach Resulting in Enantioselective Construction of a Functionalized ABC Subunit of the Tetranortriterpenoid Insect Antifeedant. J Org Chem 2006; 72:209-22. [PMID: 17194102 DOI: 10.1021/jo062068o] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A synthesis of the ABC framework of dumsin is described. The optically active intermediate 9b, which is expeditiously assembled from 5-oxobornyl pivalate by the sequential implementation of an oxy-Cope rearrangement and an intramolecular ene reaction, proved to be suitably functionalized for ultimate conversion to 5. The synthesis plan relies on two approaches to this targeted intermediate. In the first, the exocyclic double bond introduced during EtAlCl2-promoted closure of aldehyde 10b is cleaved to leave a carbonyl group that is amenable to hydride reduction and elimination of water. Cleavage of the resulting double bond with ruthenium tetroxide provided the seco ketoacid. The same advanced intermediate was obtained by initially positioning the double bond internal to the five-membered ring in advance of transient ring expansion via diketone formation and intramolecular aldolization. Both of these approaches bypass the complications arising from the substantial steric congestion prevailing in these structural networks. The task of covalently positioning an oxygen atom adjacent to the gem-dimethyl-substituted carbon in 5 was properly realized by oxidative decarboxylation. The stereochemical assignments to many of the intermediates were confirmed by an X-ray crystallographic analysis of 43.
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Affiliation(s)
- Leo A Paquette
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210-1185, USA.
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Nakamura R, Tanino K, Miyashita M. Stereoselective synthesis of premisakinolide A, the monomeric counterpart of the marine 40-membered dimeric macrolide misakinolide A. Org Lett 2006; 7:2929-32. [PMID: 15987172 DOI: 10.1021/ol050864v] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[structure: see text] The first synthesis of premisakinolide A, the monomeric counterpart of misakinolide A, the marine 40-membered macrolide displaying potent activity against a variety of human carcinoma cell lines, has been reported. The strategy was highlighted by a crucial coupling of a tetrahydropyran fragment and an alkynylaluminum reagent having a polypropionate chain, the highly stereoselective cross aldol reaction of segment A and segment B, and the stereospecific construction of the polypropionate structure based on original acyclic stereocontrol.
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Affiliation(s)
- Ryoichi Nakamura
- Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo, Japan
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14
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Santos AG, Pereira J, Afonso CAM, Frenking G. New Chiral Auxiliaries for Dynamic Kinetic Resolution: From Theory to Experiment. Chemistry 2005; 11:330-43. [PMID: 15551320 DOI: 10.1002/chem.200400512] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
New efficient chiral auxiliaries for dynamic kinetic resolution (DKR) of bromides into amines are proposed, based on a theoretical rationalisation of known literature results. One example was synthesized and tested, affording diastereoselectivities up to 100%. Several results of DKR reactions are known, based on oxazolidinone or imidazolidinone units as chiral auxiliaries. Nevertheless, their behaviour was not fully understood until a recent paper that we published. We now used our proposed mechanism to rationalize the behaviour of other similar chiral auxiliaries and to propose small structure changes in imidazolidinone rings which could largely improve their performance. We could show that the good performance of these molecules as chiral auxiliaries for DKR reactions where bromine is the leaving group and a primary or secondary amine is the nucleophile is due, in a first step, to the formation of a hydrogen bond between the amine and the ring carbonyl oxygen and, in a second step, to the strong electrostatic interaction between the leaving bromide and the carbonyl oxygen in the C-3 substituent. Considering the behaviour of this substituent which rotates to minimize the electrostatic repulsion with the bromide when reaching the transition state, we proposed the introduction of a second substituent in the C-4 position of the imidazolidinone ring, which prevents such rotation, thus increasing the energy difference between the transition states of the two distereoisomers. With such an auxiliary we were able to increase the best de known in literature (88%), when benzylamine is used as nucleophile, to 99, or even 100%, when iodide replaces the bromide in the substrate.
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Affiliation(s)
- A Gil Santos
- Requimte, CQFB, Chemistry Department, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
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15
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Bounameaux Y, Coffey JW, O'Donnell M, Kling K, Quinn RJ, Schönholzer P, Szente A, Tobias LD, Tschopp T, Welton AF, Fischli A. Synthese stereoisomerer Pinanthromboxane und Evaluation der Verbindungen als Plättchenaggregationsinhibitoren. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19830660331] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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16
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Huo J, Yang SP, Ding J, Yue JM. Cytotoxic sesquiterpene lactones from Eupatorium lindleyanum. JOURNAL OF NATURAL PRODUCTS 2004; 67:1470-1475. [PMID: 15387644 DOI: 10.1021/np040023h] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Ten new guaiane type sesquiterpene lactones, namely, eupalinilides A-J (1-10), as well as nine known compounds, eupachinilide C (11), eupachifolin D (12), eupachinilide E (13), 2alpha-hydroxyeupatolide (14), 3-deacetyleupalinin A (15), heliangine (16), 8beta-tigloyloxy-2,3-seco-6betaH,7alphaH-helianga-4Z,11(13)-diene-3,10beta;6, 12-diolid-2-oic acid (17), 8beta-(4'-hydroxytigloyloxy)-3beta,14-dihydroxy-6betaH,7alphaH-germacra-1(10)Z,4Z,11(13)-trien-6,12-olide (18), and 8beta-tigloyloxy-3beta,14-dihydroxy-6betaH,7alphaH-germacra-1(10)Z,4E,11(13)-trien-6,12-olide (19), were isolated from the whole plant of Eupatorium lindleyanum. Eupalinilides B (2), C (3), E (5), F (6), and I (9) have been tested for cytotoxicity against P-388 and A-549 tumor cell lines. The results showed that eupalinilides B (2) and E (5) demonstrated potent cytotoxicity. The structures of these compounds were determined by spectroscopic methods including 1D and 2D NMR spectra.
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Affiliation(s)
- Jun Huo
- State Key Laboratory of Drug Research, Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 555 Zuchongzhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, People's Republic of China
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17
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Yang SP, Huo J, Wang Y, Lou LG, Yue JM. Cytotoxic sesquiterpenoids from Eupatorium chinense. JOURNAL OF NATURAL PRODUCTS 2004; 67:638-643. [PMID: 15104494 DOI: 10.1021/np0304159] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Ten new sesquiterpenoids, namely, eupachinilides A-J (1-10), together with seven known sesquiterpenoids, eupachifolin D (11), budlein B (12), 8 beta-(4'-hydroxytiglyloxy)-2 beta-hydroxy-1 alpha H,5 alpha H,6 beta H,7 alpha H-guai-3,10(14),11(13)-trien-6,12-olide (13), 1,10-hydrobahia (14), 2 alpha-hydroxyeupatolide (15), eupaserrin (16), and mollisorin B (17), were isolated from the whole plant of Eupatorium chinense. Their structures were elucidated mainly by spectral methods, especially 2D NMR techniques. Eupachinilides A (1), E (5), F (6), and I (9) exhibited moderate cytotoxic activities against several tumor cell lines. The structures assigned previously for eupachifolins B (11a), C (13a), and D (11) were revised by spectral analysis and 2D NMR techniques.
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Affiliation(s)
- Sheng-Ping Yang
- State Key Laboratory of Drug Research, Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 555 Zuchongzhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, People's Republic of China
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18
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Della Monica C, Maulucci N, De Riccardis F, Izzo I. Asymmetric synthesis of (3S,4R,7S)-(−)-3-hydroxy-7-methoxy-2,2,4-trimethyl-decanoic acid, a plausible polyketide fragment of halipeptin A. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0957-4166(03)00622-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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Lafontaine JA, Provencal DP, Gardelli C, Leahy JW. Enantioselective total synthesis of the antitumor macrolide rhizoxin D. J Org Chem 2003; 68:4215-34. [PMID: 12762720 DOI: 10.1021/jo034011x] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The convergent, highly enantioselective synthesis of rhizoxin D, a natural product possessing potent antitumor and antifungal bioactivity, is described. The C(1)-C(9) fragment of the molecule was synthesized utilizing a threefold pseudosymmetric intermediate ultimately derived from gamma-butyrolactone. The central core of rhizoxin D was prepared via a chiral resolution/asymmetric aldol protocol. Several methods for the generation of the polyene fragment were explored, and the side-chain was ultimately prepared from serine in six steps. The unification of the left and right wings of the molecule was achieved using a one-step olefination protocol, and the macrocyclization was carried out using a Horner-Emmons olefination at the C(2)-C(3) olefin.
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20
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O-Protecting groups as long-range stereocontrolling elements in the addition of acetylides to 4-substituted quinolines. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0957-4166(02)00711-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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21
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André C, Bolte J, Demuynck C. Syntheses of l-threose and d-erythrose analogues modified at position 2. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0957-4166(98)00126-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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23
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24
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Fülöp F, Szakonyi Z, Bernáth G, Sohár P. Saturated heterocycles, 248. Synthesis of 2,4-dioxo and 4-oxo-2-thioxo derivatives of octahydrocyclopenta[d]pyrimidines. J Heterocycl Chem 1997. [DOI: 10.1002/jhet.5570340419] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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25
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Stepanian M, Trego WE, Bolin DG, Paquette LA, Sareth S, Riddell FG. Vicinal tetrahydrofuran polysubstitution of simulated fatty acids. Tetrahedron 1997. [DOI: 10.1016/s0040-4020(97)00446-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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26
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Paquette LA, Bennett GD, Chhatriwalla A, Isaac MB. Factors Influencing 1,4-Asymmetric Induction during Indium-Promoted Coupling of Oxygen-Substituted Allylic Bromides to Aldehydes in Aqueous Solution. J Org Chem 1997; 62:3370-3374. [PMID: 11671726 DOI: 10.1021/jo970158a] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The preparation and indium-promoted aldehyde addition reactions of a series of 3-substituted 3-oxy-1-bromo-2-methylidenepropanes under aqueous conditions are described. The (tert-butyldimethylsilyl)oxy derivatives 4a-d are the most diastereoselective of this group of reagents, giving rise to levels of syn-1,4-asymmetric induction in the range of 87-99%. Interestingly, syn stereoselectivity is eroded and reactions proceed more rapidly when the steric bulk of the oxygen substituent is reduced as in the hydroxy and methoxy derivatives. This dropoff in pi-facial differentiation with kinetic acceleration is attributed to the operation of chelation effects during oxidative addition of the metal into the carbon-bromine bond, but not during the coupling stage. Once the aldehyde enters into the coordination sphere of the indium, internal chelation to the proximal oxygen is disrupted and conformational restrictions are released. These effects, in combination with the absence of a powerful steric control element in the latter examples, permit competitive passage via syn and anti transition states.
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Synthesis, Stereochemistry and Transformations of Cyclopentane-, Cyclohexane-, Cycloheptane-, and Cyclooctane-Fused 1,3-Oxazines, 1,3-Thiazines, and Pyrimidines. ADVANCES IN HETEROCYCLIC CHEMISTRY 1997. [DOI: 10.1016/s0065-2725(08)60085-9] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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28
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Synthesis, reactions and stereochemistry of 3-hydroxymethyl-2,3-dihydro-4H-1,3-benzoxazin-4-one and some perhydrogenated derivatives. Tetrahedron 1992. [DOI: 10.1016/s0040-4020(01)81589-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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29
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Stereochemical aspects of catalytic hydrogenation of 2,3-di- and 2,3,4-tri-substituted 2-cyclopentene-1-ones and reactivity of the resulting cyclopentanones. Tetrahedron 1988. [DOI: 10.1016/s0040-4020(01)85900-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Fülöp F, Pihlaja K, Mattinen J, Bernáth G. Stereochemical studies 130 saturated heterocycles 132. Tetrahedron 1987. [DOI: 10.1016/s0040-4020(01)81498-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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31
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Stankovic S, Kapor Á, Ribár B, Kálmán A, Argay G, Karanovic L, Stájer G, Bernáth G. X-ray study of the hetero ring flexibility in cis-trimethylene- and tetramethylene-1,3-oxazin-2-ones and a cis-trimethylene-1,3-oxazine-2-thione [1]. J Mol Struct 1985. [DOI: 10.1016/0022-2860(85)85098-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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32
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33
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A regioselective enolate formation of trimethylsilylmethyl ketones application to the (E)-selective synthesis of α,β-unsaturated ketones. Tetrahedron Lett 1984. [DOI: 10.1016/s0040-4039(01)91193-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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34
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