FeCl 3 ‐Catalyzed Highly Efficient Nazarov Type Cyclization of Arylvinylcarbinols: Total Synthesis of (±)‐Dichroanal B and Related Taiwaniaquinoids †

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Abstract FeCl 3 ‐catalyzed cyclization of an arylvinyl carbinols has been explored for efficient synthesis of [6,5,6]‐carbotricyclic core of taiwaniaquinoids sharing an all‐carbon quaternary center at the pseudobenzylic position. The methodology works under mild conditions, in an open flask, to afford key carbotricyclic core in excellent yields. The strategy has been applied to a concise synthesis of naturally occurring taiwaniaquinoids, (±)‐dichroanal B ( 1 h ) in 10 steps from β‐cyclocitral 7 in 34.7 % overall yield.

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