Iron Halide-Mediated Regio- and Stereoselective Halosulfonylation of Terminal Alkynes with Sulfonylhydrazides: Synthesis of (<i>E</i>)-β-Chloro and Bromo Vinylsulfones
Halosulfonylation of terminal alkynes was achieved with sulfonylhydrazides as the sulfonyl precursor and inexpensive iron halide as halide source in the presence TBHP, allowing the regio- and stereoselective generation of (E)-beta-chloro and bromo vinylsulfones.