Abstract

A new synthesis of N-{4-[(2-methyl-4,5-dihydroimidazo[4,5-d][1]benzazepin-6(1H)-yl)carbonyl]phenyl}biphenyl-2-carboxamide monohydrochloride (1, YM087) via new imidazobenzazepine intermediates is described. This method remarkably improves the overall yield of 1 compared to the original synthesis providing a more safe, reliable and cost-efficient approach to 1.

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