Preparation of <i>Z</i>-α,β-Unsaturated Diazoketones from Aldehydes. Application in the Construction of Substituted Dihydropyridin-3-ones
作者:Isac G. Rosset、Antonio C. B. Burtoloso
DOI:10.1021/jo401191s
日期:2013.9.20
The stereoselective preparation of α,β-unsaturateddiazoketones with Z geometry is described from aldehydes and a new olefination reagent. When prepared from amino aldehydes, these diazoketones could be converted to substituted dihydropyridin-3-ones in just one step, after an intramolecular N–H insertion reaction. The straightforward synthesis of a natural trihydroxylated piperidine demonstrates the
Organocatalytic Enantioselective Sulfa-Michael Additions to α,β-Unsaturated Diazoketones
作者:Patricia B. Momo、Eduardo F. Mizobuchi、Radell Echemendía、Isabel Baddeley、Matthew N. Grayson、Antonio C. B. Burtoloso
DOI:10.1021/acs.joc.1c03045
日期:2022.3.4
Enantioselective sulfa-Michael additions to α,β unsaturated diazocarbonyl compounds have been developed. Quinine-derived squaramide was found to be the best catalyst to promote C–S bond formation in a highly stereoselective fashion for alkyl and aryl thiols. The easy-to-follow protocol allowed the preparation of 22 examples in enantiomeric ratios up to 97:3 and reaction yields up to 94%. The mechanism
Preparation of α,β-Unsaturated Diazoketones Employing a Horner−Wadsworth−Emmons Reagent
作者:Vagner D. Pinho、Antonio C. B. Burtoloso
DOI:10.1021/jo1021844
日期:2011.1.7
A new method for the preparation of α,β-unsaturateddiazoketones from aldehydes and a Horner−Wadsworth−Emmonsreagent is reported. The method was applied to the short synthesis of two substituted pyrrolidines.