Formation of Methyl 5,6-Dihydro-1,3(4H)-thiazine-4-carboxylates from 4-Allyl-1,3-thiazol-5(4H)-ones

Article abstract of DOI:10.1002/hlca.19890720724

The reaction of N-<1-(N,N-dimethylthiocarbamoyl)-1-methyl-3-butenyl>benzamid (1) with HCl or TsOH in MeCN or toluene yields a mixture of 4-allyl-4-methyl-2-phenyl-1,3-thiazol-5(4H)-one (5a) and allyl 4-methyl-2-phenyl-1,3-thiazol-2-yl sulfide (11; Scheme