| Abstract: | Reaction of 3-Amino-2H-azirines with Diphenylcyclopropenethione 3-Dimethylamino-2H-azirines ( 4a , 4b ) react with diphenylcyclopropenethione ( 8 ) to give 4(3 H)-pyridinethione derivatives of type 10 (Scheme 3). The reaction mechanism for the formation of 10 is given in Scheme 3 by analogy with a previous reported one 4] 5]. Hydrolysis of the 4(3 H)-pyridinethione 10a yields 2-oxo-2, 3-dihydro-4(1 H)-pyridinethione ( 11 ) and reduction of 10a with sodium borohydride leads to the 2, 3-dihydro-4 (1 H)-pyridinethione 12 (Scheme 4). The results of the reaction of 4a , 4b and the thione 8 demonstrate the similarity to the reaction of 4a , 4b and 2 5] (cf. Scheme 1). In contrast, the reactions of imines of type 7a with 2 and 8 , respectively, lead to different products (cf. 1] 6]). |
