Copper-catalyzed synthesis of β-haloalkenyl chalcogenides by addition of dichalcogenides to internal alkynes and its application to synthesis of (Z)-tamoxifen
作者:Nobukazu Taniguchi
DOI:10.1016/j.tet.2009.01.094
日期:2009.4
A copper-catalyzed synthesis of β-haloalkenyl sulfides or selenides was carried out by addition of dichalcogenides and tetrabutylammonium halides to internal alkynes. The present reaction anti- and regio-selectively afforded the corresponding alkenyl chalocogenides, and took advantage of both organochalcogenide-groups on dichalcogenide. Furthermore, the reaction under oxygen atmosphere could employ
Reactions of sulfenamides with alkynes in the presence of phosphorus(v) oxohalides
作者:N. V. Zyk、E. K. Beloglazkina、M. A. Belova、N. S. Zefirov
DOI:10.1007/bf02494922
日期:2000.11
The reactions of alkynes with arylsulfenamides activated with phosphorus oxohalides giving rise to aryl β-halovinyl sulfides were investigated. The reactions with acetylene, oct-1-yne, and oct-4-yne aretrans-stereospecific, whereas the reaction with phenylacetylene afforded a mixture ofcis- andtrans-addition products. The addition to unsymmetrical alkynes yielded a mixture of Markovnikoff and anti-Markovnikoff