Stereoselective synthesis of 3-hydroxy-2-sulfonyltetrahydrofurans from β-(triethylsilyloxy)aldehydes and p -tolylsulfonyldiazomethane
作者:Steven R Angle、Stephanie Z Shaw
DOI:10.1016/s0040-4020(01)00365-9
日期:2001.6
A new method for the stereoselective syntheses of 2-sulfonyltetrahydrofurans fromβ-(triethylsilyloxy)aldehydes and p-tolylsulfonyldiazomethane in the presence of BF3·OEt2 as Lewis acid is reported. The versatility of the sulfonyl functional group allows further functionalization alpha to the sulfonyl group. For example, treatment of 2-sulfonlytetrahydrofuran 2b with BF3·OEt2 and allyl silane afforded
Stereoselective Synthesis of Tetrahydropyrans via Formal [4 + 2]-Cycloaddition: A Comparison of Allylsilane and Crotylsilane
作者:Steven R. Angle、Dominique S. Belanger、Nahla A. El-Said
DOI:10.1021/jo0203342
日期:2002.11.1
two diastereomers with allylsilane, but only a single diastereomer was observed in the case of crotylsilanes. The reaction time for crotylsilanes was longer than that for allylsilanes likely due to the increased steric hindrance. Allylsilanes afforded tetrahydropyrans in 34-67% yields, and crotylsilanes provided products in 0-62% yields.
Stereoselective synthesis of 2,3,4-trisubstituted tetrahydrofurans
作者:Steven R. Angle、Daniel S. Bernier、Keith Chann、Darin E. Jones、Musong Kim、Martin L. Neitzel、Stephen L. White
DOI:10.1016/s0040-4039(98)01873-5
日期:1998.11
The stereoselective synthesis of trisubstituted tetrahydrofurans from benzyl diazoacetate and alpha-alkyl-beta-benzyloxyaldehydes or alpha-alkyl-beta-(triethylsilyl)oxyaldehydes is described. (C) 1998 Elsevier Science Ltd. All rights reserved.
Stereoselective Synthesis of 3-Hydroxy-2-aryltetrahydrofurans from β-(Triethylsilyl)oxyaldehydes and Aryldiazomethanes
作者:Steven R. Angle、Martin L. Neitzel
DOI:10.1021/jo991362w
日期:1999.11.1
Stereoselective Synthesis of Tetrahydropyrans via a Formal [4 + 2]-Cycloaddition of Allylsilanes