Facile Syntheses of 3′,4′-Methylenedioxy- 2″,2″-dimethylpyrano-[5″,6″:7,8]-flavoneand (±)-Ponganone III, Two Pyranoflavanoids

Wenfei Tan National Laboratory of Applied Organic Chemistry and Institute of Organic Chemistry, Lanzhou University, Lanzhou, 730000, P. R. China

Wei-Dong Z. Li National Laboratory of Applied Organic Chemistry and Institute of Organic Chemistry, Lanzhou University, Lanzhou, 730000, P. R. China

Chusheng Huang National Laboratory of Applied Organic Chemistry and Institute of Organic Chemistry, Lanzhou University, Lanzhou, 730000, P. R. China

Yulin Li National Laboratory of Applied Organic Chemistry and Institute of Organic Chemistry, Lanzhou University, Lanzhou, 730000, P. R. China

Yacheng Xing Department of Chemistry, Qingdao University, Qingdao, 266071, P. R. China

Abstract

Facile syntheses of two naturally occurring pyranoflavanoids, 3′,4′-methylenedioxy-2″,2″-dimethylpyrano-[5″,6″:7,8]-flavone (1) and (±)-ponganone III (2), have been achieved through the key intermediate chromene 6 by a DDQ-induced oxidative cyclization.

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Facile Syntheses of 3′,4′-Methylenedioxy- 2″,2″-dimethylpyrano-[5″,6″:7,8]-flavoneand (±)-Ponganone III, Two Pyranoflavanoids

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Facile Syntheses of 3′,4′-Methylenedioxy- 2″,2″-dimethylpyrano-[5″,6″:7,8]-flavoneand (±)-Ponganone III, Two Pyranoflavanoids

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