Palladium-Catalyzed Cascade sp<sup>2</sup>
C−H Functionalization/Intramolecular Asymmetric Allylation: From Aryl Ureas and 1,3-Dienes to Chiral Indolines
作者:Shu-Sen Chen、Min-Song Wu、Zhi-Yong Han
DOI:10.1002/anie.201702745
日期:2017.6.1
functionalization/intramolecular asymmetric allylation reaction is reported. A new chiral sulfoxide–oxazoline (SOX) ligand bearing single chiral center on the sulfur was identified as the optimal ligand for the reaction, being efficient both in the C−H cleavage step and the stereocontrol of the allylation step. The broad scope of this method with respect to aryl ureas and 1,3-dienes enables the rapid construction
报道了手性Pd II催化的级联sp 2 C H功能/分子内不对称烯丙基化反应。一种新的手性亚砜-恶唑啉(SOX)配体在硫上具有一个手性中心,被确定为该反应的最佳配体,在CH裂解步骤和烯丙基化步骤的立体控制方面均十分有效。关于芳基脲和1,3-二烯,该方法的广泛范围使得能够快速构建有价值的手性二氢吲哚衍生物,具有高收率和对映选择性(最高收率99%,最高收率95:5 er)。
A Concise Approach for the Total Synthesis of Pseudolaric Acid A
作者:Tao Xu、Chuang-chuang Li、Zhen Yang
DOI:10.1021/ol200741j
日期:2011.5.20
the stereoselective totalsynthesis of natural product pseudolaricacid A (1) was accomplished in 16 steps from commercially available starting material, featuring a samarium diiodide (SmI2)-mediated intramolecular alkene-ketyl radical cyclization and a ring-closing metathesis (RCM) reaction to stereoselectively cast the unusual trans-fused [5–7]-bicyclic core of pseudolaricacid A (1).
Formal Syntheses of (±)-Pinnaic Acid and (±)-Halichlorine
作者:Rodrigo B. Andrade、Stephen F. Martin
DOI:10.1021/ol0525009
日期:2005.12.1
[chemical reaction: see text]. Concise formal syntheses of marine alkaloids (+/-)-pinnaic acid (1) and (+/-)-halichlorine (2) have been accomplished from a common intermediate. The syntheses illustrate the utility of selective olefin crossmetathesis methodologies for the elaboration of advanced synthetic intermediates in complex molecule synthesis.
Stereodivergent Construction of 1,5/1,7‐Nonadjacent Tetrasubstituted Stereocenters Enabled by Pd/Cu‐Cocatalyzed Asymmetric Heck Cascade Reaction
作者:Panpan Li、Zijiao Liu、Xiaohong Huo、Wanbin Zhang
DOI:10.1002/anie.202407498
日期:2024.8.26
A stereodivergent construction of 1,5/1,7-nonadjacent tetrasubstituted stereocenters enabled by a Pd/Cu-cocatalyzed asymmetric Heck cascadereaction has been developed. An array of highly functionalized chiral molecules bearing two privileged scaffolds, oxindoles and α-amino acids, were smoothly prepared. Notably, all four stereoisomers of the desired products were obtained through orthogonal permutations