alkenes with tosyl cyanide was discovered. Experimental investigations revealed that the reaction was initiated by the in situ formation of sulfinyl sulfone in the presence of water. The sulfinyl sulfone species decomposed to a sulfonyl radical and a sulfinyl radical through homolytic fission. The vinyl sulfone was afforded via sequential addition of the alkene to the sulfonyl radical and the sulfinyl
anti-selective hydrosulfonylation of unactivatedalkynes with sulfonyl chlorides in the presence of a catalytic amount of phenanthroline-based Lewis base and (Me3Si)3SiH as the hydrogen atom donor has been developed. The protocol proceeds efficiently under mild and metal-free conditions, delivering a diverse set of (Z)-vinyl sulfones with high stereoselectivity. Additionally, the method displays excellent
Light-promoted photocatalyst-free and redox-neutral hydrosulfonylation of unactivated alkenes using sulfinic acid
作者:Yibo Song、Cheng Li、Xueyuan Hu、Hongdie Zhang、Yujian Mao、Xiachang Wang、Chen Wang、Lihong Hu、Jianming Yan
DOI:10.1039/d4gc00440j
日期:——
A hydrosulfonylation reaction of unactivated alkenes with sulfinicacids was realized under light irradiation. This reaction features photocatalyst- and additive-free conditions. A diverse set of unactivated alkenes can be transformed into alkyl-substituted sulfones with good yields and anti-Markovnikov regioselectivity. The present protocol was amenable to gram-scale synthesis, as well as late-stage
Pyridine and triphenylphosphine oxide activation of sulfonyl chlorides in the syntheses of (E) alk-1-enyl sulfones
作者:G. Signore、C. Malanga、R. Menicagli
DOI:10.1016/j.tet.2008.09.056
日期:2008.12
This paper describes efficient and new approaches to (E) alk-1-enyl sulfones, starting from sulfonyl chloride/pyridine or sulfonyl chloride/triphenylphosphine complexes in the presence of (E) di-iso-butyl alk-1-enyl alanes.The use of CuCl in the presence of sulfonyl chloride/pyridine complexes or pyridine in the presence of sulfonyl chloride/triphenylphosphine complexes, respectively, results in a remarkable increase in the yields and conversions. (C) 2008 Elsevier Ltd. All rights reserved.
KOBAYASHI, TOSHIFUMI;TANAKA, YUHJI;OHTANI, TAKASHI;KINOSHITA, HIDEKI;INOM+, CHEM. LETT.,(1987) N 6, 1209-1212