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Lal N, Shirsath SB, Singh P, Deepshikha, Shaikh AC. Allylsilane as a versatile handle in photoredox catalysis. Chem Commun (Camb) 2024; 60:4633-4647. [PMID: 38606528 DOI: 10.1039/d4cc00734d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/13/2024]
Abstract
Organosilanes have secured a special place in the synthetic world for several decades. However, among them, allylsilanes are a choice reagent for organic chemists to develop novel organic transformations. In recent years researchers have proved that visible-light photoredox catalysis has emerged as one of the most mild, sustainable, straightforward, and efficient strategies to construct simple to complex molecules with or without enantioselectivity. This review provides an in-depth analysis of recent advances and strategies employed in visible-light photoredox catalysis for allylsilane and its analogues for the development of various organic transformations. The review is divided into sections, each focused on a specific reactivity of allylsilane under light irradiation with C(sp2) center arene or alkene, C(sp2) center carbonyl, and C(sp3) center carbon functionality. In this review, we present optimization data, reaction scope, and mechanistic aspects to bring forward specific reactivity and selectivity trends of allylsilane in photoredox conditions.
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Affiliation(s)
- Nand Lal
- Department of Chemistry, Indian Institute of Technology, Ropar (IIT Ropar), Rupnagar, Punjab 140 001, India.
| | - Sanket B Shirsath
- Department of Chemistry, Indian Institute of Technology, Ropar (IIT Ropar), Rupnagar, Punjab 140 001, India.
| | - Puja Singh
- Department of Chemistry, Indian Institute of Technology, Ropar (IIT Ropar), Rupnagar, Punjab 140 001, India.
| | - Deepshikha
- Department of Chemistry, Indian Institute of Technology, Ropar (IIT Ropar), Rupnagar, Punjab 140 001, India.
| | - Aslam C Shaikh
- Department of Chemistry, Indian Institute of Technology, Ropar (IIT Ropar), Rupnagar, Punjab 140 001, India.
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2
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Coombs JR, Zhang L, Morken JP. Enantiomerically enriched tris(boronates): readily accessible conjunctive reagents for asymmetric synthesis. J Am Chem Soc 2014; 136:16140-3. [PMID: 25387002 DOI: 10.1021/ja510081r] [Citation(s) in RCA: 112] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The catalytic enantioselective diboration of vinyl boronate esters furnishes chiral tris(boronates) in a selective fashion. Subsequent deborylative alkylation occurs in a diastereoselective fashion, both for intermolecular and intramolecular processes.
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Affiliation(s)
- John R Coombs
- Department of Chemistry, Merkert Chemistry Center, Boston College , Chestnut Hill, Massachusetts 02467, United States
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3
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Lamas MC, Malacria M, Thorimbert S. Enantioselective Synthesis of Deoxymannojirimycin Based on Sharpless Asymmetric Epoxidation of a Highly Functionalized Allylic Alcohol. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100102] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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4
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Kyne RE, Ryan MC, Kliman LT, Morken JP. Allylation of nitrosobenzene with pinacol allylboronates. A regioselective complement to peroxide oxidation. Org Lett 2010; 12:3796-9. [PMID: 20687578 DOI: 10.1021/ol101472k] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Addition of nitrosobenzene to pinacol allylboronates leads to oxidation of the organoboron with concomitant rearrangement of the substrate alkene. This reaction appears to proceed by allylboration of the nitroso group in analogy to carbonyl and imine allylation reactions. Remarkably, the N-O bond is cleaved during the reaction such that simple alcohols are the final reaction product.
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Affiliation(s)
- Robert E Kyne
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, USA
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5
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Tessier G, Barriault L. THE CONQUEST OF VINIGROL. CREATIVITY, FRUSTRATIONS, AND HOPE. ORG PREP PROCED INT 2007. [DOI: 10.1080/00304940709458591] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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6
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Pelz NF, Morken JP. Modular Asymmetric Synthesis of 1,2-Diols by Single-Pot Allene Diboration/Hydroboration/Cross-Coupling. Org Lett 2006; 8:4557-9. [PMID: 16986949 DOI: 10.1021/ol0616891] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Chiral allyl vinyl boronates are generated by catalytic enantioselective diboration of prochiral allenes. They may then be reacted, in situ, with a hydroborating reagent to form a novel triboron intermediate. The least hindered and most reactive C-B bond then participates in cross-coupling wherein the coupling is brought about by the same catalyst as that which catalyzed the diboration reaction. The remaining C-B bonds are then oxidized in the reaction workup, thereby allowing for the modular synthesis of chiral diols in a concise single-pot fashion.
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Affiliation(s)
- Nicholas F Pelz
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA
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7
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Fransson ABL, Xu Y, Leijondahl K, Bäckvall JE. Enzymatic Resolution, Desymmetrization, and Dynamic Kinetic Asymmetric Transformation of 1,3-Cycloalkanediols. J Org Chem 2006; 71:6309-16. [PMID: 16901110 DOI: 10.1021/jo060002n] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient desymmetrization of cis-1,3-cyclohexanediol to (1S,3R)-3-(acetoxy)-1-cyclohexanol ((R,S)-2a) was performed via Candida antarctica lipase B (CALB)-catalyzed transesterification, in high yield (up to 93%) and excellent enantioselectivity (ee's up to >99.5%). (R,R)-Diacetate ((R,R)-3a) was obtained in a DYKAT process at room temperature from (1S,3R)-3-acetoxy-1-cyclohexanol ((R,S)-2a), in a high trans/cis ratio (91:9) and in excellent enantioselectivity of >99%. Metal- and enzyme-catalyzed dynamic transformation of cis/trans-1,3-cyclohexanediol using PS-C gave a high diastereoselectivity for cis-diacetate (cis/trans = 97:3). The (1R,3S)-3-acetoxy-1-cyclohexanol (ent-(R,S)-2a) was obtained from cis-diacetate by CALB-catalyzed hydrolysis in an excellent yield (97%) and selectivity (>99% ee). By deuterium labeling it was shown that intramolecular acyl migration does not occur in the transformation of cis-monoacetate to the cis-diacetate.
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Affiliation(s)
- Ann-Britt L Fransson
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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8
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Suginome M, Iwanami T, Ohmori Y, Matsumoto A, Ito Y. Stereoselective Synthesis of Highly Enantioenriched (E)-Allylsilanes by Palladium-Catalyzed Intramolecular Bis-Silylation: 1,3-Chirality Transfer and Enantioenrichment via Dimer Formation. Chemistry 2005; 11:2954-65. [PMID: 15744706 DOI: 10.1002/chem.200401031] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Highly enantioenriched (E)-allylsilanes have been synthesized from optically active allylic alcohols on the basis of Pd-catalyzed intramolecular bis-silylation followed by highly stereospecific Si-O elimination reactions. The method involves three steps: 1) O-disilanylation of the allylic alcohols with chlorodisilanes, 2) intramolecular bis-silylation in the presence of a 1,1,3,3-tetramethylbutyl isocyanide/[Pd(acac)2] (acac = acetylacetonate) catalyst at 110 degrees C, and 3) treatment of the reaction mixture with organolithium reagents. The overall transformation proceeds with nearly complete conservation of the enantiopurity of the starting allyl alcohols by transposition of the C=C bond. For instance, (R)-(E)-3-decen-2-ol (99.6-99.7 % ee) produced (S)-(E)-4-(organosilyl)-2-decene of 98.8-99.4 % ee for a variety of silyl groups, including Me3Si, Me2PhSi, tBuMe2Si, Et3Si, and iPr3Si. In the bis-silylation step, the initially formed trans-1,2-oxasiletanes immediately dimerize to stereoselectively give 1,5-dioxa-2,6-disilacyclooctanes, which are isolated in high yield by carrying out the reaction at 70 degrees C. The eight-membered ring compounds undergo thermal extrusion of (E)-allylsilanes in high yield at 110 degrees C, along with formation of 1,3-dioxa-2,5-disilacyclohexane derivatives. These in turn undergo a Peterson-type elimination by treatment with nucleophiles such as BuLi and PhLi to give the (E)-allylsilanes. All of the steps involved in the sequence proceed with extremely high stereoselectivity and stereospecificity, leading to almost complete 1,3-chirality transfer through the overall transformation. The dimerization step, which forms diastereomeric intermediates, allows the synthesis of a highly enantioenriched allylsilane (99.4 % ee) from an optically active allylic alcohol with lower enantiopurity (79.2 % ee) by enrichment of enantiopurity. A general method for the determination of the enantiomeric excesses of (E)-allylsilanes is also described in detail.
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Affiliation(s)
- Michinori Suginome
- Kyoto University, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Katsura, Kyoto 615-8510,
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9
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Chabaud L, James P, Landais Y. Allylsilanes in Organic Synthesis − Recent Developments. European J Org Chem 2004. [DOI: 10.1002/ejoc.200300789] [Citation(s) in RCA: 204] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Laurent Chabaud
- University Bordeaux‐I, Laboratoire de Chimie Organique et Organométallique, 351, Cours de la Libération, 33405 Talence Cedex, France, Fax: (internat.) + 33‐5‐40006286
| | - Philippe James
- University Bordeaux‐I, Laboratoire de Chimie Organique et Organométallique, 351, Cours de la Libération, 33405 Talence Cedex, France, Fax: (internat.) + 33‐5‐40006286
| | - Yannick Landais
- University Bordeaux‐I, Laboratoire de Chimie Organique et Organométallique, 351, Cours de la Libération, 33405 Talence Cedex, France, Fax: (internat.) + 33‐5‐40006286
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Chénedé A, Fleming I, Salmon R, West MC. Cationic rearrangements controlled by the presence of a silyl group. J Organomet Chem 2003. [DOI: 10.1016/s0022-328x(03)00548-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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11
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Synthesis and reaction of secondary and primary diorganozinc reagents using a boron–zinc exchange reaction. J Organomet Chem 2003. [DOI: 10.1016/s0022-328x(03)00237-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Betson MS, Fleming I. The Ireland–Claisen rearrangement as a probe for the diastereoselectivity of nucleophilic attack on a double bond adjacent to a stereogenic centre carrying a silyl group. Org Biomol Chem 2003; 1:4005-16. [PMID: 14664389 DOI: 10.1039/b305881f] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The E- and Z-silyl enol ethers 4 derived from allyl 3-R-3-dimethyl(phenyl)silylpropanoate (R = Me, Pr(i) and Ph) and the Z-silyl enol ethers 7 derived from 4-R-4-dimethyl(phenyl)silylbut-2-enyl acetate (R = Me and Pr(i)) undergo Ireland-Claisen rearrangements largely in the same stereochemical sense, with C-C bond formation taking place anti to the silyl group in the conformations 22, 23 and 24 in which the hydrogen atom on the stereogenic centre is inside, more or less eclipsing the double bond. The E-silyl enol ether E-7a derived from 4-methyl-4-dimethyl(phenyl)silylbut-2-enyl acetate shows low diastereoselectivity in the alternative sense, probably because C-C bond formation takes place anti to the silyl group in the conformation 26 with the methyl group inside, but the silyl enol ether E-7b derived from 4-isopropyl-4-dimethyl(phenyl)silylbut-2-enyl acetate shows low diastereoselectivity in the normal sense. The E- and Z-silyl enol ethers 33 derived from cis-crotyl 3-phenyl-3-dimethyl(phenyl)silylpropanoate and the E-silyl enol ether 39 derived from trans-crotyl 3-phenyl-3-dimethyl(phenyl)silylpropanoate undergo Ireland-Claisen rearrangements largely in the same stereochemical sense as their allyl counterparts, but with moderately high levels of diastereocontrol in setting up the third stereogenic centre following from chair-like transition structures.
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Affiliation(s)
- Mark S Betson
- Department of Chemistry, Lensfield Road, Cambridge, UK CB2 1EW
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Fleming I, Maiti P, Ramarao C. Stereocontrol of 1,5-related stereocentres using an intermediate silyl group—the diastereoselectivity of nucleophilic attack on a double bond adjacent to a stereogenic centre carrying a silyl group. Org Biomol Chem 2003; 1:3989-4004. [PMID: 14664388 DOI: 10.1039/b305880h] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
R-5-Methylcyclohex-2-enone 1 reacts successively with the phenyldimethylsilylzincate reagent and acetaldehyde to give with regiocontrol the aldols 7, dehydration of which creates the E-exocyclic double bond of the alpha,beta-unsaturated ketone 2. Conjugate addition of the ethylcuprate reagent to this compound takes place with high (96:4) selectivity in favour of the R stereoisomer 12, hydrolysis of which gives (2R,3R,5S,2'R)-2-(but-2'-yl)-3-dimethyl(phenyl)silyl-5-methylcyclohexanone 3. The oxime acetate of this ketone undergoes fragmentation in the presence of trimethylsilyl trifluoromethanesulfonate to give 3R,7R,5E-3,7-dimethylnon-5-enonitrile 4, in which an open-chain 1,5-stereochemical relationship is set up with a high level of stereocontrol. A similar sequence adding 4-methylpentylcuprate to the enone 2, and fragmentation gives 3R,7R,5E-3,7,11-trimethyldodec-5-enonitrile 20. Reduction and hydrogenation of this nitrile gives 3R,7R-3,7,11-trimethyldodecanal 22, which can be converted into phytol 25. The ketoaldehyde 29 reacts with samarium iodide to give only the alcohol 30, in which the radical anion has attacked from the top surface just like the cuprate reagents in their reactions with the ketone 2.
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Affiliation(s)
- Ian Fleming
- Department of Chemistry, Lensfield Road, Cambridge UK CB2 1EW.
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Rubin M, Schwier T, Gevorgyan V. Highly efficient B(C(6)F(5))(3)-catalyzed hydrosilylation of olefins. J Org Chem 2002; 67:1936-40. [PMID: 11895414 DOI: 10.1021/jo016279z] [Citation(s) in RCA: 245] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A convenient and highly efficient method for the Lewis acid-catalyzed trans-selective hydrosilylation of alkenes has been developed. The mechanism of this novel protocol operates via direct addition of silylium type species across C=C bond followed by trapping of the resultant carbenium ion with boron-bound hydride. A number of diversely substituted silanes possessing both aryl and alkyl groups at silicon atom were efficiently prepared using this hydrosilylation methodology. The possibility to employ aryl-containing hydrosilanes in this reaction opens broad capabilities for the synthesis of alcohols via a trans-selective hydrosilylation/Tamao-Fleming oxidation sequence, complementary to the existing cis-selective hydroboration/oxidation protocol.
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Affiliation(s)
- Michael Rubin
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061, USA
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Hupe E, Calaza M, Knochel P. Diastereoselective synthesis and reactions of diorganozinc reagents obtained after hydroborations with 9-BBN-H, thexylborane and catecholborane. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)01916-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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17
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Glekas A, Sieburth SM. Studies in silanol synthesis: internal nucleophiles and steric hindrance. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00576-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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18
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Alonso C, Nantz MH, Kurth MJ. β-Dimethylphenylsilylethyl esters: a linker for solid-phase chemistry. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(00)00909-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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19
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Cuadrado P, González-Nogal AM. Regio- and stereospecific cleavage of α,β-epoxysilanes with lithium phenylsulfide. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(99)02242-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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20
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21
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Toward a potential total synthesis of gelsemine: A regioselective hydroboration directed by a remote olefin. Tetrahedron Lett 1998. [DOI: 10.1016/s0040-4039(97)10621-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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Cuadrado P, González - Nogal AM. Regio- and Stereospecific Cleavage of α,β-Epoxysilanes with Lithium Diphenylphosphide. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)10123-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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23
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Fleming I, Barbero A, Walter D. Stereochemical Control in Organic Synthesis Using Silicon-Containing Compounds. Chem Rev 1997; 97:2063-2192. [PMID: 11848898 DOI: 10.1021/cr941074u] [Citation(s) in RCA: 735] [Impact Index Per Article: 27.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ian Fleming
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, England
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24
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Plunkett MJ, Ellman JA. Germanium and Silicon Linking Strategies for Traceless Solid-Phase Synthesis. J Org Chem 1997; 62:2885-2893. [PMID: 11671652 DOI: 10.1021/jo961889y] [Citation(s) in RCA: 112] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Here we describe the development and application of germanium and silicon linkage strategies for the solid-phase synthesis of aromatic compounds, as demonstrated for 1,4-benzodiazepine derivatives. The metal-aryl bond that attaches the benzodiazepine to the polymeric support may be cleaved by electrophilic reagents such as H(+) and Br(2) to provide the corresponding substituted derivatives. A number of compounds have been prepared in good overall yield for the eight- or nine-step process. This approach can also be applied to the solid-phase synthesis of libraries of other classes of aromatic compounds.
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Affiliation(s)
- Matthew J. Plunkett
- Department of Chemistry, University of California, Berkeley, California 94720
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25
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Suginome M, Iwanami T, Matsumoto A, Ito Y. Synthesis of highly enantio-enriched allylsilanes via palladium-catalyzed intramolecular bis-silylation. Determination of the enantiomeric excesses through regio- and stereoselective hydroboration with 9-BBN. ACTA ACUST UNITED AC 1997. [DOI: 10.1016/s0957-4166(97)00073-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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26
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1,3-Asymmetric induction in electrophilic addition onto homoallylsilanes. An approach towards the total synthesis of (+/−)-kumausyne. Tetrahedron 1997. [DOI: 10.1016/s0040-4020(97)00003-3] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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28
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Landais Y, Parra-Rapado L. Epoxidation and cyclopropanation of 2-silyl-3-alkenols. A study of 1,2-asymmetric induction. Tetrahedron Lett 1996. [DOI: 10.1016/0040-4039(95)02386-0] [Citation(s) in RCA: 23] [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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29
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Ward RA, Procter G. Allylsilanes in organic synthesis; double asymmetric induction in the dihydroxylation of a chiral allylsilane. Tetrahedron 1995. [DOI: 10.1016/0040-4020(95)00736-r] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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30
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Barbero A, Cuadrado P, Fleming I, González AM, Pulido FJ, Sánchez A. Synthesis of vinylsilanes by silyl-cupration of acetylenes using tert-butyldiphenylsilyl-cuprate reagents. ACTA ACUST UNITED AC 1995. [DOI: 10.1039/p19950001525] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Booth BL, Lawrence NJ, Pritchard RG, Rashid HS. Synthesis and X-ray crystal structure of (1S,3R,4S,1′S)-4-methyl-3-triphenyl-pnosphonium-1-[1′-methyl(methyiphenyl)]-2-hydrido-2-borazetidinium bromide—the first example of a four-membered C–B–N–C heterocycle. ACTA ACUST UNITED AC 1995. [DOI: 10.1039/c39950000287] [Citation(s) in RCA: 2] [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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32
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Evans DA, Dart MJ, Duffy JL. 1,3-asymmetric induction in hydride addition reactions to β-substituted ketones. A model for chirality transfer. Tetrahedron Lett 1994. [DOI: 10.1016/s0040-4039(00)78431-0] [Citation(s) in RCA: 21] [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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33
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Guijarro D, Mancheño B, Yus M. Direct transformation of trialkyl phosphates into organolithium compounds by a DTBB-catalysed lithiation. Tetrahedron 1994. [DOI: 10.1016/s0040-4020(01)85573-3] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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