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Abstract
A mild and efficient protocol for the synthesis of [6,5,6]-tricyclic framework (4) of abeo-abietanes (1) and gibberellins (2) via Stork–Danheiser sequence on a bicyclic vinylogous ester followed by Lewis acid-catalyzed Friedel–Crafts alkylations of 3-aryl-2-hydroxymethyl-2-cyclohexenones (5) is developed. A variety of 2-cyclohexenone derivatives (5) underwent smooth Friedel–Crafts alkylations to craft the [6,5,6]-tricyclic skeleton (4) in good to excellent yields.
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