1
|
Lepechkin-Zilbermintz V, Bareket D, Gonnord V, Steffen A, Morice C, Michaut M, Munder A, Korshin EE, Contreras JM, Cerasi E, Sasson S, Gruzman A. Moderately lipophilic 2-(Het)aryl-6-dithioacetals, 2-phenyl-1,4-benzodioxane-6-dithioacetals and 2-phenylbenzofuran-5-dithioacetals: Synthesis and primary evaluation as potential antidiabetic AMPK-activators. Bioorg Med Chem 2023; 87:117303. [PMID: 37167713 DOI: 10.1016/j.bmc.2023.117303] [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: 03/06/2023] [Revised: 04/24/2023] [Accepted: 04/26/2023] [Indexed: 05/13/2023]
Abstract
Since the 1950's, AMP-kinase (AMPK) has been used as a promising target for the development of antidiabetic drugs against Type 2 diabetes mellitus (T2D). Indeed, the canonical antidiabetic drug metformin recruits, at least partially, AMPK activation for its therapeutic effect. Herein we present design and synthesis of 20 novel relatively polar cyclic and acyclic dithioacetals of 2-(Het)arylchroman-6-carbaldehydes, 2-phenyl-1,4-benzodioxane-6-carbaldehyde, and 2-phenylbenzofuran-5-carbaldehyde, which were developed as potential AMPK activators. Three of the synthesized dithioacetals demonstrated significant enhancement (≥70%) of glucose uptake in rat L6 myotubes. Noteworthy, one of the dithioacetals, namely 4-(6-(1,3-dithian-2-yl)chroman-2-yl)pyridine, exhibited high potency comparing to other molecules. It increased the rate of glucose uptake in rat L6 myotubes and augmented insulin secretion from rat INS-1E cells in pharmacological relevant concentrations (up to 2 μM). Both effects were mediated by activation of AMPK. In addition, the compound showed excellent pharmacokinetic profile in healthy mice, including maximal oral bioavailability. Such bifunctionality (increased glucose uptake and insulin secretion) can be used as a starting point for the development of a novel class of antidiabetic drugs with dual activity that is relevant for T2D treatment.
Collapse
Affiliation(s)
| | - Daniel Bareket
- Department of Pharmacology, Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, 91120, Jerusalem, Israel
| | - Virginie Gonnord
- PRESTWICK CHEMICAL, 220 Boulevard Gonthier d'Andernach, 67400 Illkirch, France
| | - Alexandre Steffen
- PRESTWICK CHEMICAL, 220 Boulevard Gonthier d'Andernach, 67400 Illkirch, France
| | - Christophe Morice
- PRESTWICK CHEMICAL, 220 Boulevard Gonthier d'Andernach, 67400 Illkirch, France
| | - Mathieu Michaut
- PRESTWICK CHEMICAL, 220 Boulevard Gonthier d'Andernach, 67400 Illkirch, France
| | - Anna Munder
- RECIPHARM Israel Ltd., 9 Hamzamara Str., 7404709, Nes Ziona, Israel
| | - Edward E Korshin
- Department of Chemistry, Faculty of Exact Sciences, Bar-Ilan University, 52900, Ramat-Gan, Israel
| | | | - Erol Cerasi
- The Endocrinology and Metabolism Service, Department of Medicine, Hadassah-Hebrew University Medical Center, Jerusalem 91120, Israel
| | - Shlomo Sasson
- Department of Pharmacology, Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, 91120, Jerusalem, Israel
| | - Arie Gruzman
- Department of Chemistry, Faculty of Exact Sciences, Bar-Ilan University, 52900, Ramat-Gan, Israel.
| |
Collapse
|
2
|
|
3
|
Kadam KR. An expedient carbon–sulfur bond formation explored through the cellulose sulfonic acid (CSA) catalyzed dithioacetal protection of carbonyl compounds. J Sulphur Chem 2020. [DOI: 10.1080/17415993.2020.1775835] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Kailas R. Kadam
- Research Centre and Department of Chemistry, Padmashri Vikhe Patil College Pravaranagar, Ahmednagar, India
| |
Collapse
|
4
|
Abstract
The acidity ladder scale in [BMPY][NTf2] was successfully expanded toward the weak acidity region for about five more p K units compared to the previously established one. This allows the acidities of a series of 13 aliphatic and aromatic nitroalkanes to be determined accurately by the UV-vis spectroscopic method. The acidity of nitroalkane in [BMPY][NTf2] covers ∼8 p K units and is significantly weaker than those in DMSO and water. The Hammett plot for 4-substituted phenylnitromethanes shows an excellent linearity with a slope of 2.06, which is rather close to that in DMSO but significantly larger than that in water (0.80). The regression analyses reveal that the solvation behavior of [BMPY][NTf2] on the acidic dissociations of C-H acids is similar to that of DMSO.
Collapse
Affiliation(s)
- Feixiang Gao
- Center of Basic Molecular Science (CBMS), Department of Chemistry , Tsinghua University , Beijing 100084 , China
| | - Pengju Ji
- Center of Basic Molecular Science (CBMS), Department of Chemistry , Tsinghua University , Beijing 100084 , China
| | - Jin-Pei Cheng
- Center of Basic Molecular Science (CBMS), Department of Chemistry , Tsinghua University , Beijing 100084 , China.,State Key Laboratory of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering , Nankai University , Tianjin 300071 , China
| |
Collapse
|
5
|
A Novel Phenylchromane Derivative Increases the Rate of Glucose Uptake in L6 Myotubes and Augments Insulin Secretion from Pancreatic Beta-Cells by Activating AMPK. Pharm Res 2017; 34:2873-2890. [DOI: 10.1007/s11095-017-2271-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 09/24/2017] [Indexed: 01/04/2023]
|
6
|
Zhang H, Wang H, Yang H, Fu H. Rhodium-catalyzed denitrogenative thioacetalization of N-sulfonyl-1,2,3-triazoles with disulfides: an entry to diverse transformation of terminal alkynes. Org Biomol Chem 2015; 13:6149-53. [PMID: 25927418 DOI: 10.1039/c5ob00638d] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient and useful rhodium-catalyzed denitrogenative thioacetalization of N-sulfonyl-1,2,3-triazoles has been developed for the first time. The protocol uses readily available N-sulfonyl-1,2,3-triazoles and diaryl disulfides as the starting materials. The corresponding hydrolytic and reductive products with thioacetals were obtained in good to excellent yields, and the reactions were carried out easily under mild conditions with tolerance of some functional groups. Furthermore, the generated thioacetals could be transformed into some useful compounds. Therefore, the present method provides a novel and valuable strategy for the diverse transformation of alkynes.
Collapse
Affiliation(s)
- Hao Zhang
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China.
| | | | | | | |
Collapse
|
7
|
Deng H, Li X, Chu Y, He J, Cheng JP. Standard pKa Scales of Carbon-Centered Indicator Acids in Ionic Liquids: Effect of Media and Structural Implication. J Org Chem 2012; 77:7291-8. [DOI: 10.1021/jo300941g] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Hui Deng
- State Key Laboratory on Elemento-organic Chemistry, Department
of Chemistry, Nankai University, Tianjin
300071, China
| | - Xin Li
- State Key Laboratory on Elemento-organic Chemistry, Department
of Chemistry, Nankai University, Tianjin
300071, China
| | - Yuan Chu
- State Key Laboratory on Elemento-organic Chemistry, Department
of Chemistry, Nankai University, Tianjin
300071, China
| | - Jiaqi He
- State Key Laboratory on Elemento-organic Chemistry, Department
of Chemistry, Nankai University, Tianjin
300071, China
| | - Jin-Pei Cheng
- State Key Laboratory on Elemento-organic Chemistry, Department
of Chemistry, Nankai University, Tianjin
300071, China
| |
Collapse
|
8
|
Highly efficient and chemoselective method for the thioacetalization of aldehydes and transthioacetalization of acetals and acylals catalyzed by H2SO4-silica under solvent-free conditions. MONATSHEFTE FUR CHEMIE 2011. [DOI: 10.1007/s00706-011-0664-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
9
|
Islam S, Majee A, Mandal T, Khan AT. Selective Thioacetalization of Aldehydes Catalyzed by Aqueous Zinc Tetrafluoroborate. SYNTHETIC COMMUN 2011. [DOI: 10.1081/scc-200026628] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Samimul Islam
- a Department of Chemistry , Visva‐Bharati , Santiniketan, West Bengal, 731235, India
| | - Adinath Majee
- a Department of Chemistry , Visva‐Bharati , Santiniketan, West Bengal, 731235, India
| | - Tanmay Mandal
- a Department of Chemistry , Visva‐Bharati , Santiniketan, West Bengal, 731235, India
| | - A. T. Khan
- b Department of Chemistry , Indian Institute of Technology, North Guwahati , Guwahati, India
| |
Collapse
|
10
|
Iranpoor N, Firouzabadi H, Shaterian HR, Zolfigol MA. 2,4,4,6-Tetrabromo-2,5-cyclohexadienone (TABCO), N-Bromosuccinimide (NBS) and Bromine as Efficient Catalysts for Dithioacetalization and Oxathioacetalization of Carbonyl Compounds and Transdithioacetalization Reactions. PHOSPHORUS SULFUR 2010. [DOI: 10.1080/10426500211712] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Nasser Iranpoor
- a Department of Chemistry , Shiraz University , Shiraz , Iran
| | | | | | - M. A. Zolfigol
- a Department of Chemistry , Shiraz University , Shiraz , Iran
| |
Collapse
|
11
|
Green, catalyst-free thioacetalization of carbonyl compounds using glycerol as recyclable solvent. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.06.049] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
12
|
Hajipour AR, Hosseini P, Ruoho AE. Application of BU4N+HSO4 − as an Ionic Liquid and Acid Catalyst for Thioacetalization of Aldehydes and Ketones. PHOSPHORUS SULFUR 2008. [DOI: 10.1080/10426500801967757] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Abdol R. Hajipour
- a Pharmaceutical Research Laboratory, College of Chemistry , Isfahan University of Technology , Isfahan, Iran
- b Molecular and Cellular Pharmacology , University of Wisconsin Medical School , Madison, Wisconsin, USA
| | - Peyman Hosseini
- a Pharmaceutical Research Laboratory, College of Chemistry , Isfahan University of Technology , Isfahan, Iran
| | - Arnold E. Ruoho
- b Molecular and Cellular Pharmacology , University of Wisconsin Medical School , Madison, Wisconsin, USA
| |
Collapse
|
13
|
Vieira AS, Fiorante PF, Zukerman-Schpector J, Alves D, Botteselle GV, Stefani HA. Synthesis of potassium and tetra n-butylammonium 2-substituted-1,3-dithianotrifluoroborate salts and addition to chiral cyclic N-acyliminium ions. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.05.085] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
14
|
Affiliation(s)
- Habib Firouzabadi
- a Chemistry Department , College of Sciences, Shiraz University , Shiraz, Iran
| | - Arezu Jamalian
- b Medicinal & Natural Products Chemistry Research Centre, Shiraz University of Medical Sciences , Shiraz, Iran
| |
Collapse
|
15
|
Banerjee AK, Laya MS. Reagents for the preparation and cleavage of 1,3-dithiolanes. RUSSIAN CHEMICAL REVIEWS 2007. [DOI: 10.1070/rc2000v069n11abeh000583] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
16
|
Firouzabadi H, Iranpoor N, Khoshnood A, Abbasi M. Dichloro-bis(trifluoromethanesulfonate)titanium(IV) (TiCl2(SO3CF3)2) as a stable and a non-corrosive solid catalyst for the efficient and highly selective protection of carbonyl groups as their 1,3-dithianes and 1,3-dithiolanes under solvent-free conditions at room temperature. J Sulphur Chem 2007. [DOI: 10.1080/17415990701380938] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
17
|
|
18
|
Moghaddam FM, Bardajee GR, Oskui AA. A Mild and Chemoselective Dithioacetalization of Aldehydes in the Presence of Anhydrous Copper (II) Sulfate. PHOSPHORUS SULFUR 2007. [DOI: 10.1080/10426500500330810] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
| | | | - Afsane Arefi Oskui
- a Sharif University of Technology, Department of Chemistry , Tehran , Iran
| |
Collapse
|
19
|
Sánchez IH, Lemini C, Hernández C, Larraza MI, Flores HJ, García R, Machín G. Sceletium (Aizoaceae) Alkaloids : Short Total Synthesis of Racemic O-methyljoubertiamine by the Arylacetonitrile Route. SYNTHETIC COMMUN 2006. [DOI: 10.1080/00397918308061957] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
20
|
|
21
|
Nickel(II) chloride as an efficient and useful catalyst for chemoselective thioacetalization of aldehydes. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(02)02771-5] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
22
|
Firouzabadi H, Eslami S, Karimi B. Neutral Lithium Triflate (LiOTf) Efficiently Catalyzes Chemoselective Preparations of Cyclic and Acyclic Dithioacetals from Carbonyl Compounds, Acylals, and O,O-Cyclic and Open-Chain Acetals under Solvent-Free Conditions. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2001. [DOI: 10.1246/bcsj.74.2401] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
23
|
Firouzabadi H, Iranpoor N, Hazarkhani H. Iodine catalyzes efficient and chemoselective thioacetalization of carbonyl functions, transthioacetalization of O,O- and S,O-acetals and acylals. J Org Chem 2001; 66:7527-9. [PMID: 11681974 DOI: 10.1021/jo015798z] [Citation(s) in RCA: 147] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- H Firouzabadi
- Department of Chemistry, College of Sciences, Shiraz University, Shiraz, 71454, Iran.
| | | | | |
Collapse
|
24
|
Jin TS, Sun X, Ma YR, Li TS. A RAPID AND EFFICIENT METHOD OF THIOACETALIZATION OF CARBONYL COMPOUNDS CATALYSED BY POCl3-MONTMORILLNITE. SYNTHETIC COMMUN 2001. [DOI: 10.1081/scc-100103985] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
25
|
Ceschi MA, de Araujo Felix L, Peppe C. Indium tribromide-catalyzed chemoselective dithioacetalization of aldehydes in non-aqueous and aqueous media. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(00)01741-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
26
|
Mäkelä T, Matikainen J, Wähälä K, Hase T. Development of a Novel Hapten for Radioimmunoassay of the Lignan, Enterolactone in Plasma (Serum). Total Synthesis of (±)-trans-5-Carboxymethoxyenterolactone and Several Analogues. Tetrahedron 2000. [DOI: 10.1016/s0040-4020(00)00078-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
27
|
Lithium trifluoromethanesulfonate (LiOTf) as a highly efficient catalyst for chemoselective dithioacetalization of carbonyl compounds under neutral and solvent-free conditions. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)00647-4] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
28
|
Mizuno H, Domon K, Masuya K, Tanino K, Kuwajima I. Total Synthesis of (-)-Coriolin. J Org Chem 1999; 64:2648-2656. [PMID: 11674332 DOI: 10.1021/jo981478c] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient synthetic method for (-)-coriolin has been developed on the basis of a [3+2] cycloaddition reaction of a 1-(methylthio)-2-siloxyallyl cationic species and vinylsulfides. An enantiomerically pure C-ring unit was prepared through optical resolution of five-membered allyl ester 6b using a lipase. The first [3+2] cycloaddition reaction of C-ring unit (S)-7 gave bicyclic ketones 8 and 9, which were easily converted into vinyl sulfide 11. Stereoselective construction of the A-ring was achieved by the second [3+2] cycloaddition reaction of the BC-ring unit. New methods for introduction of the oxygen functional groups to the triquinane skeleton were also developed for the last stages of the total synthesis. Thus, the C7 hydroxyl group was introduced by epoxidation of dienol silyl ether 17, and stereocontrolled construction of the spiro epoxide moiety was accomplished on the basis of a Darzens-type reaction.
Collapse
Affiliation(s)
- Hajime Mizuno
- Department of Chemistry, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
| | | | | | | | | |
Collapse
|
29
|
Tandem reductive lithiations ? Carbanionic cyclizations yielding sulfur stabilized cyclopropyl- and cyclobutylcarbinyllithiums. Tetrahedron 1999. [DOI: 10.1016/s0040-4020(98)01141-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
30
|
|
31
|
Chen F, Mudryk B, Cohen T. Generation, rearrangements and some synthetic uses of bishomoallyllithiums. Tetrahedron 1994. [DOI: 10.1016/s0040-4020(01)81201-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
32
|
Cohen T, Zhang B, Cherkauskas JP. A general preparative method for carbonyl-protected γ-lithioketones via reductive lithiation. Synthetic uses of the bishomoenolate equivalents. Tetrahedron 1994. [DOI: 10.1016/s0040-4020(01)85652-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
33
|
Vogel C, Jeschke U, Vill V, Fischer H. D-Galacturonsäurederivate, VI.D-Galacturonsäurederivate mit flüssigkristallinen Eigenschaften. ACTA ACUST UNITED AC 1992. [DOI: 10.1002/jlac.1992199201192] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
34
|
Tani H, Masumoto K, Inamasu T, Suzuki H. Tellurium tetrachloride as a mild and efficient catalyst for dithioacetalization. Tetrahedron Lett 1991. [DOI: 10.1016/s0040-4039(00)78902-7] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
35
|
|
36
|
Synthesis of butanoic acid 4,4′-[(4E, 6Z, 9Z-pentadecatrien-2-ynylidene)-bis with leukotriene- like activity: Novel acetylenic acetals and dithioacetals as antagonists of leukotriene-C4. Tetrahedron Lett 1985. [DOI: 10.1016/s0040-4039(00)99018-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
37
|
|
38
|
|
39
|
|
40
|
|
41
|
Cava MP, Ahmed Z, Benfaremo N, Murphy RA, O'malley GJ. Anthraquinone dye intermediates as precursors of aklavinone-type anthracyclinones. Tetrahedron 1984. [DOI: 10.1016/s0040-4020(01)91538-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
42
|
Kumar V, Dev S. Titanium tetrachloride, an efficient and convenient reagent for thioacetalization1,1. Tetrahedron Lett 1983. [DOI: 10.1016/s0040-4039(00)81637-8] [Citation(s) in RCA: 87] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
43
|
|
44
|
|