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。
Herein we report the isolation and characterization of aminal intermediates in the organocatalytic α‐chlorination of aldehydes. These species are stable covalent ternary adducts of the substrate, the catalyst and the chlorinating reagent. NMR‐assisted kinetic studies and isotopic labeling experiments with the isolated intermediate did not support its involvement in downstream stereoselective processes
Enantioselective Linchpin Catalysis by SOMO Catalysis: An Approach to the Asymmetric α-Chlorination of Aldehydes and Terminal Epoxide Formation
作者:Muriel Amatore、Teresa D. Beeson、Sean P. Brown、David W. C. MacMillan
DOI:10.1002/anie.200901855
日期:2009.6.29
Time for SOme MOre: For the first time SOMO (singly occupied molecular orbital) activation has been exploited to allow a new approach to the α‐chlorination of aldehydes. This transformation can be readily implemented as part of a linchpincatalysisapproach to the enantioselective production of terminalepoxides.
SOme MOre 时间:首次利用 SOMO(单占据分子轨道)激活来实现醛的 α-氯化的新方法。这种转化可以很容易地作为对映选择性生产末端环氧化物的关键催化方法的一部分来实现。
Organocatalytic asymmetric fluorination of α-chloroaldehydes involving kinetic resolution
of the starting aldehydes was involved in this asymmetricfluorination. This paper describes the determination of the absolute stereochemistry of a resulting alpha-chloro-alpha-fluoroaldehyde. Some information about the substrate scope and a possible reaction mechanism are also described which shed more light on the nature of this asymmetricfluorination reaction.
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。
Mechanistically Guided Design of an Efficient and Enantioselective Aminocatalytic α-Chlorination of Aldehydes
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