An efficient methodology to substituted furans via oxidation of functionalized α-diazo-β-ketoacetates
摘要:
DMDO oxidation of functionalized alpha-diazo-beta-ketoacetates, formed by zinc triflate catalyzed Mukaiyama-aldol condensation of methyl diazoacetoacetate with aldehydes, occurred in quantitative yield to form dihydrofuranols that undergo acid catalyzed dehydration under mild conditions to generate 3-methoxy-furan-2-carboxylates in good yield. (C) 2011 Elsevier Ltd. All rights reserved.
Stereoselective Synthesis of Highly Functionalized α-Diazo-β-ketoalkanoates via Catalytic One-Pot Mukaiyama-Aldol Reactions
作者:Lei Zhou、Michael P. Doyle
DOI:10.1021/ol902872y
日期:2010.2.19
Methyl diazoacetoacetate undergoes zinc triflate catalyzed condensation with a broad selection of aldehydes to produce delta-siloxy-alpha-diazo-beta-ketoalkanoates in good yield, and delta-hydroxy-alpha-diazo-beta-ketoalkanoates are formed with high diastereoselectivity in reactions with alpha-diazo-beta-ketopentanoate promoted by dibutylboron triflate.