An extensive survey by the use of high performance liquid chromatography on racemization during the coupling of benzyloxycarbonyl-L-phenylalanyl-L-valine with L-proline tert-butyl ester.
Fürneue Synthesen der Insulin-B-Kette wurden als kondensationsfähige Fragmente die Peptid-Derivate Z-Phe-Val-Asn-Gln-N2H31 (s. Tab. 1), Z-Phe-Val-Asn-Gln-His-N2H3 (s. Tab. 2) und Z-Phe-Val-Asn-Gln-His(Bzl)-Leu-Cys(Bzl)-Gly (s. Tab. 4) durch schrittweise Kettenverlängerung mit aktivierten Estern der entsprechenden Acylaminosäuren aufgebaut. – Das Pentapeptid-Derivat wurde auch durch Fragmentkondensation
肽衍生物Z-Phe-Val-Asn-Gln-N 2 H 3 1 (请参见表1),Z-Phe-Val-Asn-Gln-His-N 2 H 3(请参见表2)和Z- Phe-Val-Asn-Gln-His(Bzl)-Leu-Cys(Bzl)-Gly(参见表4)通过与相应酰基氨基酸的活化酯进行逐步扩链。-还通过片段缩合从片段B 1-2和B 3-5合成了五肽衍生物。作为氮将序列B 1-5的末端保护基与叔丁氧羰基或胆固醇氧羰基进行比较(见表2);与预期相反,这些衍生物在有机溶剂中的溶解度甚至低于苄氧羰基衍生物。在Debye-Scherrer和长期记录的基础上讨论了该现象(请参见表3)。
Krasnobrizhii, N. Ya.; Skrynik, E. M.; Kovalenko, L. G., Journal of general chemistry of the USSR, 1980, vol. 50, # 4, p. 766 - 768
作者:Krasnobrizhii, N. Ya.、Skrynik, E. M.、Kovalenko, L. G.
DOI:——
日期:——
An extensive survey by the use of high performance liquid chromatography on racemization during the coupling of benzyloxycarbonyl-L-phenylalanyl-L-valine with L-proline tert-butyl ester.
作者:SHOJI TAKUMA、YASUMASA HAMADA、TAKAYUKI SHIOIRI
DOI:10.1248/cpb.30.3147
日期:——
The extent of racemization and the coupling efficiency during the coupling of benzyloxycarbonyl-L-phenylalanyl-L-valine with L-proline tert-butyl ester were conveniently and rapidly determined by the use of high performance liquid chromatography with high accuracy. An extensive examination of various known coupling methods revealed that the coupling methods using diphenyl phosphorazidate (DPPA) and, especially, diethyl phosphorocyanidate (DEPC) afforded the best results. Reported results using DPPA and DEPC as peptide coupling reagents are also summarized (Table I).