Synthesis and evaluation of double bond substituted combretastatins
作者:John A. Hadfield、Keira Gaukroger、Nicholas Hirst、Anna P. Weston、Nicholas J. Lawrence、Alan T. McGown
DOI:10.1016/j.ejmech.2004.12.008
日期:2005.6
A series of cornbretastatins substituted with epoxides, amides and small alkyl groups has been synthesised and evaluated for cytotoxicity and their ability to inhibit the assembly of tubulin. The methyl and ethyl substituted phenols 36, 44 have shown potent antimitotic effects whilst exhibiting reduced cytotoxicity. (c) 2005 Elsevier SAS. All rights reserved.
Synthesis of neolignans via a proposed biosynthetic intermediate. Total synthesis of (.+-.)-futoenone
作者:Steven R. Angle、Kenneth D. Turnbull
DOI:10.1021/jo00072a017
日期:1993.9
The attempted spectroscopic observation of a quinone methide proposed to be an intermediate in the biosynthesis of neolignans is reported. The results afforded substantial indirect evidence for the formation of quinone methide 3. The synthesis of racemic bicyclo[3.2.1]octenedione 22, a natural product, is proposed to occur through a similar quinone methide intermediate. The synthesis of (+/-)-futoenone via a benzylic cation intermediate related to quinone methide 3 is reported. The results provide support for Gottlieb's proposal that several different neolignans arise from a common biosynthetic precursor. The efficient synthesis of (+/-)-futoenone and related spiro[5.5]undecanoids using a Buchi quinone ketal cycloaddition is also described.