Reinvestigation of the dimerisation process forming isoglaucanic acid
摘要:
The base catalysed dimerisation of 2-[(E)-1'-pentenyl]-3-methyl maleic anhydride has been extensively reinvestigated and the relative stereochemistry of an isoglaucanic acid derivative product has been determined by X-ray crystallography. The dimerisation process has been improved and the work up has been simplified, doubling the yield. Further co-products have been isolated and characterised from which a stepwise mechanism is proposed. (C) 1999 Elsevier Science Ltd. All rights reserved.
Progress toward a Biomimetic Synthesis of Phomoidride B
作者:Gary A. Sulikowski、Weidong Liu、Fabio Agnelli、R. Michael Corbett、Zhushou Luo、Stefan J. Hershberger
DOI:10.1021/ol025595c
日期:2002.5.1
[GRAPHIC]An intramolecular cyclization strategy for effecting a biomimetic synthesis of the core structure of the fungal secondary metabolites phomoidrides A and B is described. The cyclization substrate 20 is prepared in eight steps from dibromide 10. Treatment of 20 with triethylamine in acetonitrile results in a rapid cyclization to give 21 and 22 in good yield.