γ-Lactone Formation in the Addition of Benzenesulfonyl Bromide to Diene and Enyne Esters
作者:Chen Wang、Glen A. Russell
DOI:10.1021/jo982388a
日期:1999.3.1
The gem-dialkyl effect has been used to promote the formation of functionalized gamma-lactones in the addition of benzenesulfonyl bromide to diene and enyne esters. Introduction of 3 mol % of pyridine into the reactions increases the yields of lactones produced from tertiary esters. Formation of the C-alpha-C-beta bond of gamma-lactones has been achieved in both C-alpha-->C beta and C-beta-->C-alpha radical cyclization directions.
JUNGHEIM, LOUIS N.;BARNETT, CHARLES J.;GRAY, JOSEPH E.;HORCHER, LINUS H.;+, TETRAHEDRON., 44,(1988) N 11, 3119-3126
作者:JUNGHEIM, LOUIS N.、BARNETT, CHARLES J.、GRAY, JOSEPH E.、HORCHER, LINUS H.、+
DOI:——
日期:——
Copper-Catalyzed Aerobic Oxidative NS Bond Functionalization for CS Bond Formation: Regio- and Stereoselective Synthesis of Sulfones and Thioethers
A regio‐ and stereoselective synthesis of sulfones and thioethers by means of CuI‐catalyzedaerobicoxidativeNS bond cleavage of sulfonyl hydrazides, followed by cross‐coupling reactions with alkenes and aromatic compounds to form the CS bond, is described herein. N2 and H2O are the byproducts of this transformation, thus offering an environmentally benign process with a wide range of potential