New Tetracyclic Colchicinoids from the Reaction of N‐Deacetylthiocolchicine and N‐Deacetylcolchicine with Nitrous Acid and tert‐Butyl Nitrite

Abstract Reaction of N ‐deacetylthiocolchicine ( 3 ) and N ‐deacetylcolchicine ( 4 ) with nitrous acid (HONO) furnished the new tetracyclic colchicinoids 5 a...