Nitric Acid Promoted Metal-Free Bromothiolation of Internal Alkynes with Hydrobromic Acid and Disulfides
作者:Xiao-Cheng Huang、Han Sun、Zhi-Xiang Yao、Hui Su
DOI:10.1055/s-0040-1719934
日期:2022.9
A novel, metal-free bromo-thiolation of internal alkynes with hydrobromicacid and disulfides has been developed. The reaction is promoted by commercial-grade nitricacid and is used to construct a series of unexplored β-bromoalkenyl sulfides in moderate to good yield. Most products were obtained with high stereoselectivity as syn-configured tetrasubstituted alkenes. Both sulfide groups of the disulfide
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