Regioselective 1,3-dipolar cycloadditions of a 'thiocarbonyl-methanide' ((alkylidenesalfonio)methanide) with aromatic sulfines

Article abstract of DOI:10.1002/hlca.19960790105

Reaction of the spirocyclic 2,5-dihydro-1,3,4-thiadiazole 7 and thiobenzophenone S-oxide (6a) in THF at 45° yielded the spirocyclic 1,3-dithiolane 1-oxide 8, thiirane 9, and the diazane derivative 10 in a ratio of 61:15:23 (Scheme 2) The formation of 8 is