Synthesis of peptides containing various functions was efficiently accomplished by treatment of the tetrabutylammonium salts of N-protected amino acids (or peptides) with amino acid esters in the presence of bis(o- or p-nitrophenyl) phenylphosphonate. Synthesis of leucine-enkephalin was successfully achieved by the above method employing a (3+2) or (4+1) fragment coupling approach.
A Proposal for Using Mild Bases in the Preparation of Optically Pure Peptides
作者:Shumpei Sakakibara、Masumi Itoh
DOI:10.1246/bcsj.40.656
日期:1967.3
p-nitrophenyl ester was studied with various tertiary amines; N, N-dialkylglycine esters and N-ethylmorpholine were found to induce less racemization than triethylamine. Furthermore, these mild bases were strong enough in many cases to liberate free amino acid or peptide esters from their salts. It was also confirmed that a mixture of an amino acid or peptide ester salt and such a mild base could be used in the
用各种叔胺研究了 N-羧基苯甲氧基-S-苄基-L-半胱氨酸对硝基苯酯的碱催化外消旋化反应;发现 N, N-二烷基甘氨酸酯和 N-乙基吗啉比三乙胺诱导更少的外消旋化。此外,这些弱碱在许多情况下足够强以从它们的盐中释放游离氨基酸或肽酯。也证实了氨基酸或肽酯盐和这种弱碱的混合物可以代替先前制备的游离酯用于肽合成,并且在与酰基氨基酸的偶联反应过程中几乎没有观察到外消旋化活性酯。Anderson 的外消旋化试验也是通过混合酸酐程序用这些弱碱代替三乙胺进行的;发现弱碱在光学纯度方面产生更好的结果。
Gibian,H.; Schroeder,E., Justus Liebigs Annalen der Chemie, 1961, vol. 642, p. 145 - 162
作者:Gibian,H.、Schroeder,E.
DOI:——
日期:——
van Orden; Smith, Journal of Biological Chemistry, 1954, vol. 208, p. 751,753