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.
Catalytic Addition Methods for the Synthesis of Functionalized Diazoacetoacetates and Application to the Construction of Highly Substituted Cyclobutanones
作者:Michael P. Doyle、Kousik Kundu、Albert E. Russell
DOI:10.1021/ol052003s
日期:2005.11.1
[reaction: see text] Methyl 3-(trialkylsilanyloxy)-2-diazo-3-butenoate undergoes Lewis acid-catalyzed Mukaiyamaaldol addition with aromatic and aliphatic aldehydes in the presence of low catalytic amounts of Lewis acids in nearly quantitative yields. Scandium(III) triflate is the preferred catalyst and, notably, addition proceeds without decomposition of the diazo moiety. Diazoacetoacetate products
An efficient methodology to substituted furans via oxidation of functionalized α-diazo-β-ketoacetates
作者:Phong Truong、Xinfang Xu、Michael P. Doyle
DOI:10.1016/j.tetlet.2010.11.166
日期:2011.4
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.