Lipase-mediated resolution of the hydroxy-cyclogeraniol isomers: application to the synthesis of the enantiomers of karahana lactone, karahana ether, crocusatin C and γ-cyclogeraniol
作者:Stefano Serra、Francesco G. Gatti、Claudio Fuganti
DOI:10.1016/j.tetasy.2009.05.013
日期:2009.6
study on the lipase PS-mediated resolution of different hydroxy-geraniol isomers is reported. A number of α-, β- and γ-isomers bearing a 2-, 3- or 4-hydroxy functional group were synthesised regioselectively and then submitted to the lipase-mediated kinetic acetylation. The latter experiments showed that the 2-hydroxy isomers 4, 5 and 14 (α, γ and β, respectively) as well as cis-3-hydroxy α-cyclogeraniol
A novel approach to the Taxol A-ring synthetic equivalents
作者:Zhang-Hua Gao、Bing Liu、Wei-Dong Z. Li
DOI:10.1016/j.tet.2005.08.061
日期:2005.11
A novel short approach to the A-ring synthetic equivalents of Taxol was described. Oxabicyclic ketone 3 served as a versatile template for selective functionalization leading to oxabicyclic vinylic ether 6 in two steps, which was hydrolyzed under mild acidic conditions to afford the hydroxy aldehyde derivative 7. Synthetic equivalents 2 of Taxol A-ring were thus, accessible from hydroxy aldehyde 7. (c) 2005 Elsevier Ltd. All rights reserved.
Stereo- and regio-selective Ti-mediated radical cyclization of epoxy-alkenes: synthesis of the A and C ring synthons of paclitaxel
We have developed a practical synthetic route for the A and C rings of paclitaxel. The key reaction is a Ti-mediated radical cyclization of an epoxyalkene. (C) 2001 Elsevier Science Ltd. All rights reserved.
Taxol synthesis: Synthesis of A-ring and a methodology for substituted cyclohexadienes
作者:J.S. Jadav、Dale Srinivas
DOI:10.1016/s0040-4039(97)10038-7
日期:1997.11
A fully functionalised synthesis of taxolA-ring, through Michael/Wittig reaction and regioselective opening epoxide as key steps and also a methodology for substituted cyclohexadienes through tandem Michael/Wittig reaction is described.