New Thienothiadiazines and Pyridothiadiazines from N-Cyanoimidates and Sulfoximides

Article abstract of DOI:10.1055/s-1987-28132

Reaction of the N-cyanoimidates 1a-d, 1f-h with the sulfoximides 2a-b yields the open chain products 3a-d, 3f-h, 4a-d and 4f-h. 3e and 4e are obtained from 3f and 4f in boiling pyrrolidine.If treated with sodium hydride 3a-e cyclise to the thienothiadiazines 5a-e. 4a-d react under the same conditions in a different way and give the pyrimidothiadiazines 8a-d. 3f and 4f are converted into the thiazoles 10a-b with thioglycolic acid methyl ester.