Reactions of sodium cyanoborohydride with benzothiazolium and Δ2-thiazolinium cations. Formation of benzothiazolines, thiazolidines and stable thiazaboroles
Sodiumcyanoborohydride reduction of benzothiazolium and Δ2-thiazolinium cations give benzothiazolines and thiazolidines alongwith [[-(disubstituted amino) phenyl] and 2-(dialkylamino)ethyl]thio]boranecarbonitriles (-) and . Because of the heterocyclic structures formed through N→ B coordination and consequent chirality, the latter species constitute mixtures of two diastereomers which are exceptionally