Heterocyclic ring-closure reactions. 6. Preparation and further cyclization reactions of 5-imino-1, 3-diphenyl-4-thioxo-2-imidazolidinone and 5-imino-1, 3-diphenyl-2, 4- …
R Ketcham, E Schaumann
文献索引：Ketcham, Roger; Schaumann, Ernst Journal of Organic Chemistry, 1980 , vol. 45, # 19 p. 3748 - 3750
Phenyl isocyanate (la) and phenyl isothiocyanate (lb) react with cyanothioformanilide (2b) to give the title compounds 3b and 3c. With additional la, 3b, c provide the 5-(N- phenylcarbamoyl) derivatives 4b, c. With hydrochloric acid, 3b, c afford the 4-0XO compounds 5a, b, whereas excess hydrochloric acid converts 3c into the 2, 5- thiazolidinedione 6. With hydrogen sulfide, 3c gives phenyldithiooxamide (7) and 3b the 4 ...
