Direct Asymmetric α‐Sulfamidation of α‐Branched Aldehydes: A Novel Approach to Enamine Catalysis
Direct Asymmetric α‐Sulfamidation of α‐Branched Aldehydes: A Novel Approach to Enamine Catalysis
复制标题
α-支链醛的直接不对称α-磺酰胺化:烯胺催化的新方法
DOI:
10.1002/ejoc.200600587
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发表时间:
2006
影响因子:
2.8
通讯作者:
Stefan Bräse
中科院分区:
文献类型:
--
作者:
H. Vogt;T. Baumann;M. Nieger;Stefan Bräse
Proline-catalysed reactions between α-branched aldehydes and sulfonyl azides provide scalemic configurationally stabilised α-sulfamidated products with ee values of up to 86 %. The reactions can also be carried out in a one-pot fashion, with catalyst, aldehyde, sulfonyl chloride and sodium azide. The proposed mechanism differs fundamentally from the mechanistic model usually ascribed to enamine catalysis, containing as a key step the diastereoselective cycloaddition of the azide to an enamine formed in situ. The products obtained in the reaction can be converted into the corresponding unnatural amino acids in two additional steps.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
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