Ir-Catalyzed Asymmetric Cascade Allylation/Spiroketalization Reaction for Stereoselective Synthesis of Oxazoline-Spiroketals
作者:Hui Yan、Xusheng Shao、Xiaoyong Xu、Zhong Li、Wu-Lin Yang
DOI:10.1021/acs.orglett.2c03885
日期:2023.1.20
An asymmetric cascade allylation/spiroketalization reaction between 2-(1-hydroxyallyl)phenols and 5-methyleneoxazolines is accomplished by using a chiral Ir(I) catalyst derived from commercially available iridium precursor and the Carreira ligand. This protocol furnishes a class of structurally novel and unique oxazoline-spiroketals in up to 86% yield, >99% ee and >20:1 dr. Moreover, control experiments
2-(1-羟基烯丙基) 酚和 5-亚甲基恶唑啉之间的不对称级联烯丙基化/螺缩酮化反应是通过使用衍生自市售铱前体和 Carreira 配体的手性 Ir(I) 催化剂完成的。该方案提供一类结构新颖且独特的恶唑啉-螺缩酮,产率高达 86%,>99% ee 和 >20:1 dr。此外,对照实验表明,5-亚甲基恶唑啉上的 4,4-二取代对于避免芳构化和发生螺缩酮化是必要的。在此基础上,说明了一个似是而非的反应机理。
A catalytic approach for the synthesis of allylic azides from aryl vinyl carbinols
作者:G. Srinu、P. Srihari
DOI:10.1016/j.tetlet.2013.02.094
日期:2013.5
A metal-free and catalytic approach for the preparation of allylic azides starting from aryl vinyl carbinols is described herein. (C) 2013 Elsevier Ltd. All rights reserved.