Two Reaction Modes of Pyridinium 1,4-Zwitterionic Thiolates with Sulfenes: Synthesis of 3H-1,2-Dithiole 2,2-Dioxides, 1,9a-Dihydropyrido[2,1-c][1,4]thiazines, and Indolizines.
2020
Two reaction modes of pyridinium
1,4-zwitterionic thiolates with
sulfenes generated in situ from alkanesulfonyl chlorides are described
with DIPEA as the base. 3H-1,2-Dithiole 2,2-dioxides
could be obtained via a formal [3 + 2] pathway from alkylmethanesulfonyl
chlorides, while 1,9a-dihydropyrido[2,1-c][1,4]thiazines
were obtained via a stepwise [(5 + 2) – 1] pathway from phenylmethanesulfonyl
chlorides. Moreover, as an application, indolizines could be accessed
via a stepwise {[(5 + 2) – 1] – 1} pathway, with 1,9a-dihydropyrido[2,1-c][1,4]thiazines as the transient intermediates.
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