Development of Zn-ProPhenol-Catalyzed Asymmetric Alkyne Addition: Synthesis of Chiral Propargylic Alcohols
作者:Barry M. Trost、Mark J. Bartlett、Andrew H. Weiss、Axel Jacobi von Wangelin、Vincent S. Chan
DOI:10.1002/chem.201202085
日期:2012.12.14
The development of a general and practical zinc‐catalyzed enantioselective alkyneaddition methodology is reported. The commercially available ProPhenol ligand (1) has facilitated the addition of a wide range of zinc alkynylides to aryl, aliphatic, and α,β‐unsaturated aldehydes in high yield and enantioselectivity. New insights into the mechanism of this reaction have resulted in a significant reduction
Transition-Metal-Catalyzed Synthesis of Aspergillide B: An Alkyne Addition Strategy
作者:Barry M. Trost、Mark J. Bartlett
DOI:10.1021/ol300200m
日期:2012.3.2
catalytic enantioselective formal total synthesis of aspergillide B is reported. This linchpin synthesis was enabled by the development of new conditions for Zn-ProPhenol catalyzed asymmetric alkyneaddition. This reaction was used in conjunction with ruthenium-catalyzed trans-hydrosilylation to affect the rapid construction of a late-stage synthetic intermediate of aspergillide B to complete a formal
报道了曲霉内酯 B 的催化对映选择性形式全合成。这一关键合成是通过开发 Zn-ProPhenol 催化不对称炔加成的新条件而实现的。该反应与钌催化的氢化硅烷化反应结合,影响曲霉内酯B后期合成中间体的快速构建,高效完成曲霉内酯B的正式合成。
Total Syntheses of (−)-Macrolactin A, (+)-Macrolactin E, and (−)-Macrolactinic Acid: An Exercise in Stille Cross-Coupling Chemistry
作者:Amos B. Smith、Gregory R. Ott
DOI:10.1021/ja980203b
日期:1998.4.1
The total syntheses of the potent antiviral agent (−)-macrolactin A (1) and two related family members, (+)-macrolactin E (5) and (−)-macrolactinic acid (7), have been achieved, exploiting a unified, convergent, and highly stereocontrolled strategy. Extensive use of the palladium-catalyzed Stille cross-coupling reaction for the stereospecific construction of the three isolated dienes including macrocyclization
强效抗病毒剂 (-)-macrolactin A (1) 和两个相关的家族成员 (+)-macrolactin E (5) 和 (-)-macrolactinic acid (7) 的全合成已经实现,利用统一的、收敛和高度立体控制的策略。广泛使用钯催化的 Stille 交叉偶联反应来构建三种分离的二烯(包括大环化),这是成功策略的基石。这些天然产物的全合成不再通过发酵获得,证实了它们的相对和绝对立体化学,并为进一步的生物学研究提供了可能的类似物。
(+)-Brefeldin A (1) was synthesized by using (+)-4-cyanomethylcyclopent-2-ene-1-one (2) as a key compound. 4-Hydroxy-2-enoate functionality was built by the reaction of the aldehyde (7) with (S)-ethyl p-chlorophenylsulfinylacetate.
(+)-Brefeldin A (1) 通过使用 (+)-4-氰甲基环戊-2-烯-1-酮 (2) 作为关键化合物进行了合成。4-羟基-2-烯酸酯基团由醛 (7) 与 (S)-乙基-p-氯苯亚砜乙酸酯的反应构建而成。
Total Synthesis of Both Enantiomers of Macrocyclic Lactone Aspergillide C
作者:P. Srihari、Y. Sridhar
DOI:10.1002/ejoc.201100917
日期:2011.11
A facile approach to the totalsynthesis of both enantiomers of the 14-membered macrolactone aspergillide C is described. The strategy employed was also utilized for the synthesis of C4-epimers of both the enantiomers of aspergillide C. The key reactions include Sharpless kinetic resolution, Achmatowicz reaction, Ferrier type alkynylation, hydrosilylation-protodesilylation, Corey–Bakshi–Shibata (CBS)
描述了一种简单的方法来全合成 14 元大环内酯曲霉内酯 C 的两种对映异构体。所采用的策略也用于合成曲霉醇 C 对映异构体的 C4-差向异构体。 关键反应包括 Sharpless 动力学拆分、Achmatowicz 反应、Ferrier 型炔基化、氢化硅烷化-原脱甲硅烷化、Corey-Bakshi-Shibata (CBS) 介导的还原和山口大环内酯化。