A Short Entry to α-Substituted γ-Alkylidene Pentenolides. Synthesis and Preliminary Biological Evaluation of Novel Gelastatin Analogues
作者:Jan Pavlík、Ivan Šnajdr、Jiří Kuneš、Marcel Špulák、Milan Pour
DOI:10.1021/jo802082t
日期:2009.1.16
Biologically interesting 2-substituted 4-alkylidene pentenolides were prepared with complete control of regio- and stereoselectivity from 2-iodo allylic alcohols via an array of Pd-catalyzed processes, including alkynylation with methyl propiolate, tributyltin hydride addition, and alpha-functionalization. Some of the compounds possess selective cytostatic activity against ovarian carcinoma HeLa S3 and leukemia CCRF-CEM cell lines.
Cyclization of 2-Alkynylallyl Alcohols to Highly Substituted Furans by Gold(I)-Carbene Complexes
作者:A. Stephen K. Hashmi、Tobias Häffner、Matthias Rudolph、Frank Rominger
DOI:10.1002/ejoc.201001479
日期:2011.2
Various 2-alkynylallylalcohols were synthesized by a generally applicable Sonogashira coupling protocol. Subsequent gold-catalyzed transformation was investigated. The use of AuI catalysts bearing carbene ligands, of either the N-heterocyclic carbene or nitrogen acyclic carbene type, delivered the desired products with low catalyst loadings and under very mild reaction conditions. A broad array of