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Disubstituted-α-chloroenamines are useful synthetic intermediates which had earlier been prepared by the reaction of tertiary amides with phosgene. The toxicity of the latter led us to systematically investigate new synthetic routes towards α-chloro- and α-bromoenamines. The reactions of various halogenating agents (SOCl 2 , diphosgene, triphosgene, OPCl 3 , OPBr 3 ) with tertiary...
1,10,11,11a-tetrahydropyrrolo[2,1-c][1,4]benzodiazepin-5,11-diones 3a-d in concentrated hydrochloric acid rearranged into the new 2,3,4,4a-tetrahydropyrrolo[2,1-b]quinazolin-9(1H)-one 1-car☐ylic acids 4a-d in a very good yield.
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