Ethyl 2-Cyano-2-(2-nitrobenzenesulfonyloxyimino)acetate (<i>o</i>-NosylOXY): A Recyclable Coupling Reagent for Racemization-Free Synthesis of Peptide, Amide, Hydroxamate, and Ester
作者:Dharm Dev、Nani Babu Palakurthy、Kishore Thalluri、Jyoti Chandra、Bhubaneswar Mandal
DOI:10.1021/jo500292m
日期:2014.6.20
byproducts that can be easily recovered and reused for the synthesis of the same reagent, making the method more environmentally friendly and cost-effective. The synthesis of amides, hydroxamates, peptides, and esters using this reagent is described. The synthesis of the difficult sequences, for example, the islet amyloid polypeptide (22–27) fragment (with a C-terminal Gly, H-Asn-Phe-Gly-Ala-Ile-Leu-Gly-NH2)
酰胺和酯官能团的普遍存在使偶联反应极为重要。尽管可获得许多偶联试剂,但是制备常用且有效的试剂的方法繁琐。这些试剂会产生大量化学废物,并且缺乏可回收性。2-氰基-2-(2-硝基苯磺酰氧基亚氨基)乙酸乙酯(o-NosylOXY)是新一代偶联试剂的第一成员,可产生副产物,这些副产物可以轻松回收并再利用以合成同一试剂,从而使该方法更加环保且具有成本效益。描述了使用该试剂合成酰胺,异羟肟酸酯,肽和酯。困难序列的合成,例如,胰岛淀粉样多肽(22–27)片段(具有C末端Gly,H-Asn-Phe-Gly-Ala-Ile-Leu-Gly-NH 2)和酰基载体蛋白(65-74)片段(H-Val-Gln-Ala-Ala-Ile-Asp-Tyr-Ile-Asn-Gly-OH),遵循固相肽合成(SPPS)协议和淀粉样蛋白β(39–42)肽(Boc-Val-Val-IIe-Ala-OMe),遵循溶液相策略得到证明。