Abstract
Photolysis of chromium alkoxycarbene complexes with N-(benzyloxycarbonyl)imidazolines produced protected azapenams. Hydrogenolysis gave free azapenams which stable, one of which was characterized by X-ray crystallography. Hydrogenolysis under acidic conditions produced hexahydro-1,4-diazepin-5-ones. treatment of the free azapenams with camphorsulfonic acid produced unsaturated 14-membered tetraazamacrocycles in excellent yield. These were reduced to dioxocyclams
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