Total Synthesis of (−)-Xylogranatopyridine B via a Palladium-Catalyzed Oxidative Stannylation of Enones
作者:Alexander W. Schuppe、David Huang、Yifeng Chen、Timothy R. Newhouse
DOI:10.1021/jacs.7b13189
日期:2018.2.14
We report a total synthesis of the pyridine-containing limonoid alkaloid (-)-xylogranatopyridine B in 11 steps from commercially available dihydrocarvone. The central pyridine ring was assembled by a late-stage fragment coupling approach employing a modified Liebeskind pyridine synthesis. One fragment was prepared by an allyl-palladium catalyzed oxidativeenone β-stannylation, in which the key bimetallic
我们报告了含吡啶的柠檬苦素生物碱 (-)-xylogranatopyridine B 在 11 个步骤中从市售二氢香芹酮的全合成。中央吡啶环通过后期片段偶联方法组装,采用改良的 Liebeskind 吡啶合成。一个片段是通过烯丙基-钯催化的氧化烯酮β-甲锡烷基化制备的,其中关键的双金属β-甲锡烷基钯烯醇化物中间体经历了β-氢化物消除。这种方法还允许在烯酮的 β 位引入烷基和甲硅烷基。
Difluorotris(pentafluoroethyl)phosphorane—A highly active catalyst for Diels–Alder reaction
found to catalyze Diels–Alder reactions of α,β-unsaturated ketones or aldehydes with conjugateddienes or cyclodienes providing the cycloaddition products in high yields. Only a small quantity of this catalyst is required to complete the Diels–Alder reaction. The developed protocol is more convenient than the procedures reported in the literature. Several cyclohexene, naphthalene and norbornene derivatives
发现二氟三(五氟乙基)磷烷(C 2 F 5)3 PF 2催化α,β-不饱和酮或醛与共轭二烯或环二烯的狄尔斯-阿尔德反应,可高产率地提供环加成产物。完成Diels-Alder反应只需要少量的这种催化剂。开发的协议比文献中报道的过程更方便。以中等至良好的产率获得了几种环己烯,萘和降冰片烯衍生物。
A general route for total synthesis of 9-alkyl-9-hydroxy aklavinones and pyrromycinones
作者:Frank M. hauser、Subbaro prasanna
DOI:10.1016/s0040-4020(01)91533-9
日期:1984.1
-A general route for convergent, regiospecific synthesis of 9-alkyl-9-hydroxy anthracyclinones with the aklavin and pyrromycin oxygenation patterns is described.