Transition-metal-free base-controlled highly regioselective synthesis of alkyl 1,2-bis(boronates) or 1,1,2-tris(boronates) from various terminal alkynes has been disclosed.
tert-Butyl hydroperoxide-initiated radical cyclization of 2-alkynylthioanisoles or -selenoanisoles with sulfinic acids has been developed. This reaction is applicable to a wide substrate scope via one C(sp)-S(Se) bond cleavage and two C(sp)-S(Se) bond formation, leading to the synthesis of 3-(arylsulfonyl)benzothiophenes or -benzoselenophenes under mild conditions.
A radical-promoted
cyclization of methylthiolated alkynones with
diverse radical precursors has been developed. This strategy occurred
via a C(sp2)–S bond formation and C(sp3)–S cleavage sequence and allows an efficient synthesis of
a variety of phosphoryl-, sulfenyl-, CF2COOEt-, and acyl-containing
thiochromone derivatives in moderate to good yields under mild conditions.
A photoredox-catalyzed cascade annulation of methyl(2-(phenylethynyl)phenyl)sulfanes and methyl(2-(phenylethynyl)phenyl)selanes with sulfonyl chlorides was developed.
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