Mercury(II)-Mediated Cleavage of Cyclopropylcarbinols by an Intramolecular Sulfinyl Group as a Stereo- and Regioselective Route to Stereotriads and Stereotetrads
摘要:
Mercury(II) salt mediated opening of cyclopropylcarbinols by an intramolecular sulfinyl group is disclosed. All four diastereomeric stereotriads have been prepared from cis- and trans-disubstituted cyclopropanes. The trisubstituted cyclopropanes also react regio- and stereoselectively to afford products possessing quaternary stereogenic centers. The reaction is clean and general.
开发了铑(I)催化的环丁醇的高对映选择性开环和异构化反应。该反应为合成带有β-叔立构中心的手性无环酮提供了一种温和、原子经济且氧化还原中性的方法。使用 C3 位带有烷氧基取代基的环丁醇可以获得优异的对映选择性和高产率。机理研究表明,环丁醇仅发生分子内氢迁移,( Z )-不饱和酮中间体的形成对于实现高对映选择性至关重要。
Studies on the enantioselectivity of the transesterification of 2-methyl-1,4-butanediol and its derivatives catalyzed by Pseudomonas fluorescens lipase in organic solvents
The irreversible transesterification of 2-methyl-1,4-butanediol 1a and its benzyl ethers 2a and 3a catalyzed by Pseudomonasfluorescenslipase in chloroform was studied, the highest ee (>98%) having been obtained for the 4-benzyl ether 2a.
Stereodivergent Construction of [5,5]-Oxaspirolactones of Phainanoids
作者:Lizhi Xun、Zhijiang Zhang、Yuqiao Zhou、Song Qin、Shaomin Fu、Bo Liu
DOI:10.1021/acs.joc.2c03091
日期:2023.3.17
A stereodivergent synthesis of [5,5]-oxaspirolactones of phainanoids is presented herein. Through precisely tuning the inherent substitution differences on cyclopropanol, a palladium-catalyzed cascade carbonylative lactonization enables the stereodivergent synthesis of [5,5]-oxaspirolactones of phainanoids.