(R)-2,3-Cyclohexylideneglyceraldehyde, a novel template for facile and simple entry into chiral hydroxy γ-lactones: synthesis of (−)-muricatacin
摘要:
(R)-2,3-Cyclohexylideneglyceraldehyde 1 has been used in a simple and efficient synthesis of (-)-muricatacin 10. The required chiron, syn-alkanetriol 2a was prepared by the reduction of a ketone 3 derived from 1. (c) 2005 Elsevier Ltd. All rights reserved.
(R)-2,3-Cyclohexylideneglyceraldehyde, a novel template for facile and simple entry into chiral hydroxy γ-lactones: synthesis of (−)-muricatacin
摘要:
(R)-2,3-Cyclohexylideneglyceraldehyde 1 has been used in a simple and efficient synthesis of (-)-muricatacin 10. The required chiron, syn-alkanetriol 2a was prepared by the reduction of a ketone 3 derived from 1. (c) 2005 Elsevier Ltd. All rights reserved.
<i>syn</i>
‐Selective Epoxidation of Chiral Terminal Allylic Alcohols with a Titanium Salalen Catalyst and Hydrogen Peroxide
作者:Fabian Severin、Giovanni M. Fusi、Christina Wartmann、Jörg‐Martin Neudörfl、Albrecht Berkessel
DOI:10.1002/anie.202201790
日期:2022.6.27
asymmetric epoxidation/kinetic resolution provides access to anti-configured terminal epoxy alcohols with high selectivity, no analogous syn-selective epoxidation process has been available. We report that this “missing link” is provided by a readily available titaniumsalalencatalyst. Besides allylic alcohols, allylic ethers are epoxidized with extreme syn-selectivity, at low catalyst loading, with
虽然 Sharpless 不对称环氧化/动力学拆分提供了以高选择性获得反构型末端环氧醇的途径,但目前还没有类似的顺选择性环氧化工艺。我们报告说,这种“缺失的环节”是由现成的钛 salalen 催化剂提供的。除了烯丙醇外,烯丙醚在低催化剂负载下以极高的顺式选择性环氧化,使用水性 H 2 O 2作为氧化剂。