Aryl-participated intramolecular cyclisation of diazomethyl ketones. stereo-controlled synthesis of bridged tetracyclic systems related to terpenoids
Abstract
New stereocontrolled routes to the bridged tetracyclic ketones (2) and (3) have been developed utilising acid-catalysed intramolecular cyclisation of the diazomethyl ketones (19) and (22) as the key steps.