The solvent was removed under reduced pressure to give a residue which was treated with water to give 0.2 g of a product which melted at 219°on recrystallization from 2-propanol and was identical with lb described above by mixture melting point, spectral comparison, and tic behavior.iV-Thioformyl derivative 4e was obtained in 71% yield by refluxing 4b with thiophosgene in toluene: mp 236°on recrystallization from methylene chloride-ether; ir 3250, 1660, and 1610 cm-1.

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