The chemistry of .alpha.-silyl carbonyl compounds. 10. A two-step preparation of .alpha.-alkylidene .gamma.-lactones from .gamma.-lactones: a synthesis of (.+-.)-ancepsenolide
作者:Gerald L. Larson、Rosa M. Betancourt de Perez
DOI:10.1021/jo00225a052
日期:1985.12
PALMISANO, GIOVANNI;DANIELI, BRUNO;LESMA, GIORDANO;PASSARELLA, DANIELE, TETRAHEDRON, 45,(1989) N1, C. 3583-3596
Enantioselective Total Synthesis of (+)- and (−)-Nigellamine A<sub>2</sub>
作者:Jianwei Bian、Matthew Van Wingerden、Joseph M. Ready
DOI:10.1021/ja061559n
日期:2006.6.1
The nigellamine alkaloids are dolabellanediterpenes displaying potent lipid metabolism-promoting activity. Total synthesis of (+)- and (-)-nigellamine A2 has been accomplished. Absolute stereochemistry of synthetic nigellamine A2 was established through an intramolecular asymmetric allylic alkylation using a Pd(phosphinooxazoline) catalyst. Other notable transformations include a radical alkynylation
奈杰明生物碱是多标签烷二萜,显示出有效的脂质代谢促进活性。(+)-和(-)-nigelamine A2的全合成已经完成。合成奈杰胺 A2 的绝对立体化学是通过使用 Pd(膦基恶唑啉) 催化剂的分子内不对称烯丙基烷基化建立的。其他值得注意的转化包括自由基炔基化、非对映选择性 Nozaki-Hiyama-Kishi 环化以及区域和立体选择性催化环氧化。在光学活性中间体的 X 射线晶体学分析的基础上,我们已经确认了天然产物的指定绝对立体化学。此处概述的合成序列的微小修改应提供对其他尼杰拉敏生物碱的访问。
Synthetic studies on indole alxaloids. A stereocontrolled entry to the cuanzine structural unit