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。
Synthesis of Chiral<i>N</i>-Sulfonyl and<i>N</i>-Phosphinoyl α-Halo Aldimine Precursors
作者:Gretchen R. Stanton、Mehmet Göllü、Rebecca M. Platoff、Corinne E. Rich、Patrick J. Carroll、Patrick J. Walsh
DOI:10.1002/adsc.201200864
日期:2013.3.11
aldimines have emerged as an important class of synthetic intermediates. The stability and reactivity of α‐halo aldimines can vary greatly depending on the nitrogen protecting group. A general synthesis of stable, chiral α‐halo‐N‐sulfonyl and N‐phosphinoyl aldimine precursors is presented (42–96% yield). The corresponding α‐halo aldimines can be isolated upon treatment with a mild base. Enantioenriched α‐chloro
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。
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
The direct organocatalytic enantioselective α-chlorination of aldehydes has been developed. The reaction proceeds for a series of different aldehydes with NCS as the chlorine source using easily available catalysts such as l-proline amide and (2R,5R)-diphenylpyrrolidine. The α-chloro aldehydes are obtained in up to 99% yield and up to 95% ee. The synthetic utility of the enantioselective α-chlorination