Ethyl 2-(<i>tert</i>-Butoxycarbonyloxyimino)-2-cyanoacetate (Boc-Oxyma): An Efficient Reagent for the Racemization Free Synthesis of Ureas, Carbamates and Thiocarbamates via Lossen Rearrangement
作者:Srinivasa Rao Manne、Kishore Thalluri、Rajat Subhra Giri、Jyoti Chandra、Bhubaneswar Mandal
DOI:10.1002/adsc.201600661
日期:2017.1.4
Boc‐Oxyma (Ethyl 2‐(tert‐butoxycarbonyloxyimino)‐2‐cyanoacetate) has been reported previously as an efficient coupling reagent for the synthesis of amides, peptides, esters, thioesters and hydroxamic acids. It is known for its excellent racemization suppression capability, and also as an environment friendly reagent as it generates only Oxyma as solid byproduct that can be recovered easily and recycled
Boc-Oxyma(乙基2-(叔)先前已报道了-(丁氧基羰基氧基亚氨基)-2-氰基乙酸酯)作为合成酰胺,肽,酯,硫代酸酯和异羟肟酸的有效偶联剂。众所周知,它具有出色的消旋抑制能力,并且还作为一种环境友好的试剂,因为它仅生成作为固体副产物的Oxyma,可以容易地回收并循环用于合成同一试剂。在此更新中,我们报告了一种简单,高效,环境友好,无化学选择和无消旋作用的方法,该方法可通过使用Boc-Oxyma通过Lossen重排从异羟肟酸合成尿素,氨基甲酸酯和硫代氨基甲酸酯。通过使用该方案,我们已经以非常高的收率获得了无消旋的二肽和三肽基脲。还进行了严格的机械研究。