The Daphniphyllum Alkaloids: Total Synthesis of (−)-Calyciphylline N
作者:Artem Shvartsbart、Amos B. Smith
DOI:10.1021/ja503899t
日期:2015.3.18
Presented here is a full account on the development of a strategy culminating in the first totalsynthesis of the architecturally complex daphniphyllumalkaloid, (−)-calyciphylline N. Highlights of the approach include a highly diastereoselective, intramolecular Diels–Alder reaction of a silicon-tethered acrylate; an efficient Stille carbonylation of a sterically encumbered vinyl triflate; a one-pot
这里介绍的是对结构复杂的瑞香生物碱 (−)-calyciphylline N 的首次全合成策略的开发的完整描述。该方法的亮点包括硅-的高度非对映选择性、分子内 Diels-Alder 反应。系链丙烯酸酯;空间阻碍的乙烯基三氟甲磺酸酯的高效 Stille 羰基化;一锅纳扎罗夫环化/原脱甲硅烷基化序列;以及完全取代的二烯酯的化学选择性氢化。
Synthesis of (R)-ar-turmerone and its conversion to (R)-ar-himachalene, a pheromone component of the flea beetle: (R)-ar-himachalene is dextrorotatory in hexane, while levorotatory in chloroform
作者:Kenji Mori
DOI:10.1016/j.tetasy.2004.11.077
日期:2005.2
(R)-ar-Turmerone was synthesized from (4-methylphenyl)acetic acid by employing Evans asymmetric alkylation as the key step. (R)-ar-Turmerone was converted to (R)-ar-himachalene, which was dextrorotatory in hexane while levorotatory in chloroform. Enantiomerically impure (75% ee) (R)-3-(4-methylphenyl)butanoic acid crystallized more readily than the enantiomerically pure one.
Efficient parallel resolution of pentafluorophenyl active esters using quasi-enantiomeric combinations of oxazolidin-2-ones
作者:Najla Al Shaye、Sameer Chavda、Elliot Coulbeck、Jason Eames、Yonas Yohannes
DOI:10.1016/j.tetasy.2011.02.021
日期:2011.2
The parallel resolution of racemic pentafluorophenyl 2-aryl/phenylpropanoates and butanoates using an equimolar combination of quasi-enantiomeric Evans oxazolidin-2-ones is discussed. The levels of diastereoselectivity were excellent (>90% de) leading to separable quasi-enantiomeric oxazolidin-2-ones in good yield. This methodology was used to resolve a series of structurally related 2-aryl/phenylpropanoic and butanoic acids. (C) 2011 Elsevier Ltd. All rights reserved.