Pacharin: a new dibenzo(2,3-6,7)oxepin derivative from bauhinia racemosa lamk
作者:A.S.R. Anjaneyulu、A.V. Raghava Reddy、D.S.K. Reddy、R.S. Ward、D. Adhikesavalu、T. Stanley Cameron
DOI:10.1016/s0040-4020(01)98799-x
日期:——
The isolation of resveratrol and a new dibenzoxepin derivative, pacharin, from the heartwood of Lank is reported. The structure of pacharin has been established as l,7-dlhydroxy-3-methoxy-2-methyl-dibenzo(2,3-6,7) oxepin (Va) by a study of its chemical and spectroscopic properties, including X-ray analysis.
The synthesis of pacharin: a dibenzoxepine from the heartwood of Bauhinia racemosa Lamk.
作者:Mark F. Comber、Melvyn V. Sargent
DOI:10.1039/p19900001371
日期:——
The synthesis of the novel dibenzoxepine derivative pacharin (13)(8-methoxy-7-methyldibenz[b,f]-oxepine-1,6-diol), a constituent of the heartwood of BauhiniaracemosaLamk., is described The route depended on the formation of the diphenyl ether (8) which was converted by standard synthetic steps into the bisphosphonium salt (11). The derived bis-ylide underwent oxidative cyclization to the dibenzoxepine