A highly diastereoselective approach to tetrahydrofurans via [3+2] cycloadditions of silylmethyl-substituted cyclopropanes with aldehydes and ketones
摘要:
An efficient and highly diastereoselective synthesis of highly substituted tetrahydrofurans from the reaction of a vicinal t-butyldiphenylsilylmethyl-substituted cyclopropyl diester with aldehydes and ketones has been developed. The 2,5-cis-disubstitution predominates over the 2,5-trans-disubstitution by as much as 12:1. The reaction with cyclic ketones generates spiro-fused tetrahydrofurans in good yields. (c) 2006 Elsevier Ltd. All rights reserved.
Silicon-Assisted Ring Opening of Donor−Acceptor Substituted Cyclopropanes. An Expedient Entry to Substituted Dihydrofurans
摘要:
[GRAPHICS](tert-Butyldiphenylsilyl)methylcyclopropanes undergo ring opening to furnish substituted dihydrofurans in good to excellent yields on treatment with TiCl4 in dichoromethane. The silicon that assists the regioselective ring opening is retained in the product to allow further functional group manipulations.
A highly diastereoselective approach to tetrahydrofurans via [3+2] cycloadditions of silylmethyl-substituted cyclopropanes with aldehydes and ketones
作者:Archana Gupta、Veejendra K. Yadav
DOI:10.1016/j.tetlet.2006.09.064
日期:2006.11
An efficient and highly diastereoselective synthesis of highly substituted tetrahydrofurans from the reaction of a vicinal t-butyldiphenylsilylmethyl-substituted cyclopropyl diester with aldehydes and ketones has been developed. The 2,5-cis-disubstitution predominates over the 2,5-trans-disubstitution by as much as 12:1. The reaction with cyclic ketones generates spiro-fused tetrahydrofurans in good yields. (c) 2006 Elsevier Ltd. All rights reserved.
Silicon-Assisted Ring Opening of Donor−Acceptor Substituted Cyclopropanes. An Expedient Entry to Substituted Dihydrofurans
作者:Veejendra K. Yadav、Rengarajan Balamurugan
DOI:10.1021/ol0163169
日期:2001.8.1
[GRAPHICS](tert-Butyldiphenylsilyl)methylcyclopropanes undergo ring opening to furnish substituted dihydrofurans in good to excellent yields on treatment with TiCl4 in dichoromethane. The silicon that assists the regioselective ring opening is retained in the product to allow further functional group manipulations.