A TBAF-mediated Chemoselective Method for Synthesis of 4-Methylbutenolides and 4-Hydroxy-4-methylbutenolides from 3-Hydroxy-4-(tert-butyldimethylsilyloxy)pentanoates
Highly Stereoselective and Modular Syntheses of 10-Hydroxytrilobacin and Three Diastereomers via Stereodivergent [3 + 2]-Annulation Reactions
作者:Chan Woo Huh、William R. Roush
DOI:10.1021/ol801242d
日期:2008.8.7
convergent synthesis of the annonaceous acetogenin, 10-hydroxytrilobacin ( 4a), was accomplished by using the [3 + 2]-annulation reaction of tetrahydrofuranyl carboxaldehyde 2a and allylsilane 3. The stereodivergency of the [3 + 2]-annulation reaction made it possible to achieve modular, highly stereoselective syntheses of three 10-hydroxytrilobacin diastereomers from the same precursors by using simple
Parallel Fragment Assembly Strategy Towards Multiple-Ether Mimicry of Anticancer Annonaceous Acetogenins
作者:Sheng Jiang、Yan Li、Xiao-Guang Chen、Tai-Shan Hu、Yu-Lin Wu、Zhu-Jun Yao
DOI:10.1002/anie.200352681
日期:2004.1.5
A TBAF-mediated Chemoselective Method for Synthesis of 4-Methylbutenolides and 4-Hydroxy-4-methylbutenolides from 3-Hydroxy-4-(<i>tert</i>-butyldimethylsilyloxy)pentanoates
作者:Chunhong Li、Jijun Xue、Baiyan Xu、Zhixiang Xie、Ying Li
DOI:10.1246/cl.2007.1058
日期:2007.8.5
A chemoselective synthesis of butenolides was found based on TBAF-mediated deprotection, cyclization, dehydration, and oxidation of 3-hydroxy-4-(tert-butyldimethylsilyloxy)pentanoates, which yielded either 4-methylbutenolides or 4-hydroxy-4-methylbutenolides in moderate to good yields. The selectivity depends on the quantity of TBAF. This method was applied to the synthesis of several 4-butenolide compounds.