Enantioselective Syntheses of Ring-C Precursors of Vitamin B12. Substrate Control. A Novel Si-Assisted Elimination of Vinyl Bromides
摘要:
[GRAPHICS]Homochiral ring-C precursors 34 of Vitamin B-12 have been prepared by Ireland-Claisen rearrangement of allyl esters 32, followed by a novel Si-assisted elimination of HBr.
Enantioselective Syntheses of Ring-C Precursors of Vitamin B12. Substrate Control. A Novel Si-Assisted Elimination of Vinyl Bromides
摘要:
[GRAPHICS]Homochiral ring-C precursors 34 of Vitamin B-12 have been prepared by Ireland-Claisen rearrangement of allyl esters 32, followed by a novel Si-assisted elimination of HBr.
作者:Hans J. Reich、Martha J. Kelly、Richard E. Olson、Ronald C. Holtan
DOI:10.1016/s0040-4020(01)88593-8
日期:1983.1
A series of silylketones has been prepared by appropriate manipulation of ⇌-silylated allenol ethers. Among the compounds prepared were alkenyl, alkynyl and acyl silylketones. The spectroscopic properties of representative members of these classes of compounds have been measured, and some of their chemical reactions studied Diels-Alder cycloadditions of vinyl and alkynyl silylketones proceed smoothly