T. Patonay et al., Oxazepines and thiazepines, 36. Diastereoselective sulfoxidation of 2,3-dyhydro-1,5-benzothiazepin-4(5H)-ones by dimethyldioxirane, HETEROCYCLE, 51(1), 1999, pp. 85-94
The highly chemoselective dimethyldioxirane oxidation of 2-substituted 2,3-
dihydro-1,5-benzothiazepin-4(5H)-one (1) allows the synthesis of the corres
ponding sulfoxides (2) or sulfones (3) in good yields. The relative stereoc
hemistry of the sulfoxides has been unequivocally determined by X-Ray and N
MR methods. The high trans diastereoselectivity can be explained on the bas
is of steric control.