Cu-catalyzed cross-coupling of α-aryl-α-diazoesters with sulfonyl hydrazides is explored to access α-carbonyl sulfones via migratory insertion of Cu-carbene species.
Continuous-flow generation of diazoesters and their direct use in S–H and P–H insertion reactions: synthesis of α-sulfanyl, α-sulfonyl, and α-phosphono carboxylates
作者:Hannah E. Bartrum、David C. Blakemore、Christopher J. Moody、Christopher J. Hayes
DOI:10.1016/j.tet.2013.01.020
日期:2013.3
The synthesis of α-sulfanyl, α-sulfonyl, and α-phosphono carboxylates has been achieved using a two-step procedure involving the in-flow generation of diazoesters from sulfonylhydrazones, via Bamford–Stevens elimination, and then subsequent S–H, sulfinate, and P–H carbene insertion reactions. The method for α-sulfonyl ester is particularly noteworthy as it represents a very atom economic (‘green’)