methylthiotransferases. Although the thiol–ene reaction for carbon–sulfur bond formation has found widespread applications in materials or medicinal science, a biocompatible chemo- and regioselectivehydrothiolation of unactivated alkenes and alkynes remains elusive. Here, we describe the design of a general chemoselective anti-Markovnikov hydroalkyl/aryl thiolation of alkenes and alkynes—also allowing
Palladium-Catalyzed Synthesis of 2,3-Disubstituted Benzothiophenes via the Annulation of Aryl Sulfides with Alkynes
作者:Yoshihiro Masuya、Mamoru Tobisu、Naoto Chatani
DOI:10.1021/acs.orglett.6b02055
日期:2016.9.2
A new method has been developed for the synthesis of 2,3-disubstituted benzothiophenes involving the palladium-catalyzed annulation of arylsulfides with alkynes. This convergent approach exhibited good functional group tolerance, providing rapid access to a diverse array of derivatives from simple, readily available starting materials. This protocol can also be used to synthesize 2-silyl-substituted
Novel phenyl migration of 1-phenylbenzo[b]thiophenium triflates in the thermolysis
作者:Tsugio Kitamura、Bian-Xiang Zhang、Yuzo Fujiwara
DOI:10.1016/s0040-4039(02)00216-2
日期:2002.3
Thermolysis of 1-phenylbenzo[b]thiophenium triflates at 180°C causes phenyl migration to give 2-phenylbenzo[b]thiophenes in high yields. Interestingly, the thermolysis of 1-phenylbenzo[b]thiophenium triflates having a substituent at the 2 position affords the corresponding 3-phenylbenzo[b]thiophenes. On the basis of the thermolysis of 2-(4-methylphenyl)-1-phenylbenzo[b]thiophenium triflate, a consecutive
1-苯基苯并[ b ]噻吩三氟甲磺酸盐在180℃下的热分解导致苯基迁移,从而以高收率得到2-苯基苯并[ b ]噻吩。有趣的是,在2位具有取代基的1-苯基苯并[ b ]噻吩三氟甲磺酸酯的热解得到相应的3-苯基苯并[ b ]噻吩。基于2-(4-甲基苯基)-1-苯基苯并[ b ]噻吩鎓三氟甲磺酸酯的热解,提出了连续的[1,5]σ重排用于苯基迁移。
EXCLUSIVE CYCLIZATION AT SULFUR IN PHOTOLYSIS OF β-[(<i>o</i>-ARYLTHIO)PHENYL]VINYL BROMIDES
Photolysis of β-[(o-arylthio)phenyl]vinyl bromides, in contrast to the oxy-derivatives, resulted in exclusive cyclization at sulfur to give 1-benzothiophenes. The results were discussed by the nature of sulfur.