Benzimidazoles, 1-subst

A number of heterocyclics such as coumarins, flavones, and quino-lones have been prepared from o-subst. co-(methylsulfinyl)aceto-phenones . A simple isoindole synthesis with hydrazines has been published Phenolic coupling with PdCl2 has been used efficiently to produce carpanone whereby five contiguous asym. centers with the correct stereochemistry have been introduced in a single step . A facile synthesis of the tetracyclic skeleton of rheadan alkaloids, whidi have a characteristic azepine ring, has been reported Benzimidazoles and benzoxazoles have been prepared by a novel ring closure of a-amino-/9,7-ethylenenitriles . ... 

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