is presented. The procedure requires the easily available terminal alkynes as starting materials as well as commercially and readily available reagents such as diethylthiophosphite. The experimental procedure consists of a one‐pot process without any slow addition of one of the reagents.
method for cyclization of alkynes is described. The reaction cascade involves the intermolecular addition of a phenylthiyl radical to a terminal triple bond generating an alkenylradical, followed by a 1,5-hydrogen atom transfer and a 5-exo-trig radicalcyclization. This very efficient tin-free procedure allows one to prepare highly functionalized cyclopentane derivatives as well as fused bicyclic and
Hydrosulfonylation Reaction with Arenesulfonyl Chlorides and Tetrahydrofuran: Conversion of Terminal Alkynes into Cyclopentylmethyl Sulfones
作者:Christian Simon Gloor、Fabrice Dénès、Philippe Renaud
DOI:10.1002/anie.201707791
日期:2017.10.16
chain reaction to convert terminal alkynes into arenesulfonylmethylcyclopentanes is described. The reaction involves a radical addition–translocation–cyclization process and necessitates solely the use of readily available arenesulfonyl chlorides in tetrahydrofuran. Interestingly, this radical‐mediated C−H activation process took place with a high level of retention of configuration when an enantiomerically
Dimethyl Phosphite Mediated Hydrogen Atom Abstraction: A Tin-Free Procedure for the Preparation of Cyclopentane Derivatives
作者:Florent Beaufils、Fabrice Dénès、Philippe Renaud
DOI:10.1002/anie.200501309
日期:2005.8.19
Direct Carbocyclization of Aldehydes with Alkynes: Combining Gold Catalysis with Aminocatalysis
作者:Jörg T. Binder、Benedikt Crone、Timm T. Haug、Helge Menz、Stefan F. Kirsch
DOI:10.1021/ol800092p
日期:2008.3.1
A combination of gold(l) complexes and amine bases catalyzes the 5-exo-dig cyclization of formyl alkynes. This direct alpha-functionalization of aldehydes with unactivated alkynes does not involve the use of preformed enol equivalents.