Diastereoselective synthesis of 3,6-dihydro-2H-1,3,4-thiadiazines
摘要:
Thionation of the benzil hydrazones 3 with Lawesson's reagent afforded the 3,6-dihydro-2H-1,3,4-thiadiazines 4 by an intramolecular cyclisation. This reaction was shown to be diastereospecific and allowed the formation of the exo compounds 4b-e. When the homochiral SAMP-hydrazone 3f was used, the reaction afforded enantiomerically pure (4R,6R,9S)-4f. (C) 1998 Elsevier Science Ltd. All rights reserved.