A one-pot, two-step protocol for the synthesis of libraries of remarkable functionalized sulfone analogues of 9b,10,10a,10b-tetrahydro-1-cyclopropa[][1,4]thiazino[4,3-]quinolines is described. A class of various functionalized molecular skeletons was obtained by cyclopropanation of quinolinium zwitterionic thiolates. The reaction pathway involves the formation of a [2 + 1] cycloaddition intermediate followed by a [5 + 1] cycloaddition.
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