<scp>l</scp>-Cysteine, a Versatile Source of Sulfenic Acids. Synthesis of Enantiopure Alliin Analogues
作者:Maria C. Aversa、Anna Barattucci、Paola Bonaccorsi、Placido Giannetto
DOI:10.1021/jo048662k
日期:2005.3.1
generation of transient sulfenic acids, such as 4, 6, 9, and 15, which add to suitable acceptors, allowing formation of sulfoxides showing a biologically active residue. These sulfoxides are easily isolated in enantiomerically pure form. For instance, N-(tert-butoxycarbonyl)-l-cysteine methyl ester (1a) furnished in few steps sulfenic acid 9a, which was readily converted into (R,SS)-(2-tert-butoxycarbonylam
升-半胱氨酸是用于瞬时次磺酸的产生酸的刺激起始产物,如4,6,9,和15,其添加到合适的受体,从而允许形成亚砜表示具有生物活性的残基的。这些亚砜很容易以对映体纯的形式分离。例如,N-(叔丁氧基羰基)-1-半胱氨酸甲酯(1a)分几个步骤提供,亚磺酸9a易于转化为(R,S S)-(2-叔丁氧基羰基氨基-2-甲氧基羰基-乙亚硫基)乙烯(22)的Boc-保护的甲酯也不-alliin。此外,向2-甲基-1-丁烯-3-炔中添加9a导致了硫差向异构且可分离的混合物为(R)-2-(2-叔丁氧基羰基氨基-2-甲氧基羰基-乙基亚磺酰基)-3-一旦二烯被转化为所需的衍生物,仍可从其半胱氨酸部分产生的“甲基”-甲基-1,3-二烯10a和11a仍具有“掩盖的”亚磺酸功能。