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Published on: September 1, 2011
Flavans and diphenylpropanes with PTP1B inhibition from Broussonetia kazinoki
Jing-Jing Xue1, Chun Lei1, Pei-Pei Wang2
1Department of Pharmacognosy, School of Pharmacy, Fudan University, Shanghai 201203, PR China.
Abstract:
Three new (1a/1b and 2b) and five known flavans (2a, 6a/6b, 7, and 8), one new flavan glycoside (3), and two new (4 and 5) and six known 1,3-diphenylpropanes (9-14) were isolated from the twigs of Broussonetia kazinoki. Compounds 1, 2, and 6 are scalemic mixtures, and were resolved by chiral HPLC to provide 1a/1b, 2a/2b, and 6a/6b. The structures of these compounds were elucidated by extensive spectroscopic methods, including NMR, MS, and ECD analyses. Compounds 1, 2, 5, 8, 9, 11, and 12 showed in vitro inhibition of protein tyrosine phosphatase 1B (PTP1B).
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