Trichloromethanesulfonyl Chloride: A Chlorinating Reagent for Aldehydes
作者:Ciril Jimeno、Lidong Cao、Philippe Renaud
DOI:10.1021/acs.joc.5b02543
日期:2016.2.5
commercially available reagent, has been found to perform efficiently in the α-chlorination of aldehydes, including its catalytic asymmetric version, under very mild reaction conditions. Under our reaction conditions, this compound outperforms typical chlorinatingreagents for organic synthesis, facilitates workup and purification of the product, and minimizes the formation of toxic, chlorinated organic waste
已经发现三氯甲磺酰氯(CCl 3 SO 2 Cl),一种可商购的试剂,在非常温和的反应条件下,在醛的α-氯化反应中,包括催化的不对称形式,都能有效地进行醛的氯化反应。在我们的反应条件下,该化合物的性能优于用于有机合成的典型氯化试剂,有助于产品的后处理和纯化,并最大程度地减少了有毒的氯化有机废物的形成。
A general, enantioselective synthesis of 2-substituted thiomorpholines and thiomorpholine 1,1-dioxides
作者:Carson W. Reed、Craig W. Lindsley
DOI:10.1016/j.tetlet.2019.151104
日期:2019.10
In the course of our drug discovery programs, we had need to access chiral, 2-substituted thiomorpholines and their oxidized congeners, thiomorpholine 1,1-dioxides. Here, we disclose a high-yielding, general protocol for the enantioselective synthesis of C2-functionalized thiomorpholines and thiomorpholine 1,1-dioxides.
The enantioselective aminocatalytic α-chlorination of aldehydes is a challenging reaction because of its tendency to proceed through neutral intermediates in unselective pathways. Herein we report the rational shift to a highly selective reaction pathway involving charged intermediates using hexafluoroisopropanol as solvent. This change in mechanism has enabled us to match and improve upon the yields
Enantioselective α-Chlorination of Aldehydes with Recyclable Fluorous (S)-Pyrrolidine-Thiourea Bifunctional Organocatalyst
作者:Chun Cai、Wei Zhang、Liang Wang、Dennis Curran
DOI:10.1055/s-0029-1219198
日期:2010.2
A novel fluorous (S)-pyrrolidine-thiourea bifunctional organocatalyst is prepared. The catalyst shows good activity and enantioselectivity for direct α-chlorination of aldehydes using N-chlorosuccinimide (NCS) as the chlorine source. It can be recovered from the reaction mixture by fluorous solid-phase extraction with excellent purity for direct reuse.
Direct and Enantioselective Organocatalytic α-Chlorination of Aldehydes
作者:Michael P. Brochu、Sean P. Brown、David W. C. MacMillan
DOI:10.1021/ja049562z
日期:2004.4.1
The first direct enantioselective catalytic α-chlorination of aldehydes has been accomplished. The use of enamine catalysis has provided a new organocatalytic strategy for the enantioselective chlorination of aldehydes to generate α-chloro aldehydes, an important chiral synthon for chemical and medicinal agent synthesis. The use of imidazolidinone 3 as the asymmetric catalyst has been found to mediate