Total Syntheses of Ningalins D and G

초록

A flexible synthetic strategy for the total syntheses of ningalins D and G is described. The highly effective TMS-OTf/2,6-lutidine-mediated [3,3]-sigmatropic rearrangement of densely loaded dinaphthyl hydrazides and cyclization of the resulting 2,2'-diamino-1,1'-dinaphthyls afforded the key 7H-dibenzo[c,g]carbazole intermediates. Successful conversions to biphenylene quinone methides followed by regioselective brominations completed the total syntheses of the titled marine alkaloids.

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