Highly enantioselective alkylation of glycine methyl and ethyl ester derivatives under phase-transfer conditions: its synthetic advantage
摘要:
Phase-transfer alkylation of the benzophenone Schiff base of glycine methyl or ethyl ester (2) was found to be catalyzed by 3,4,5-F-3-C6H2-NAS-Br [(S,S)-1] with high efficiency and excellent enantioselectivity. This procedure allows facile derivatization of the resulting alkylation products to other synthetically useful chiral building blocks. (C) 2003 Elsevier Ltd. All rights reserved.
Highly enantioselective alkylation of glycine methyl and ethyl ester derivatives under phase-transfer conditions: its synthetic advantage
摘要:
Phase-transfer alkylation of the benzophenone Schiff base of glycine methyl or ethyl ester (2) was found to be catalyzed by 3,4,5-F-3-C6H2-NAS-Br [(S,S)-1] with high efficiency and excellent enantioselectivity. This procedure allows facile derivatization of the resulting alkylation products to other synthetically useful chiral building blocks. (C) 2003 Elsevier Ltd. All rights reserved.
作者:Lihu Yang、Greg Morriello、Yanping Pan、Ravi P. Nargund、Khaled Barakat、Kristine Prendergast、Kang Cheng、Wanda W.-S. Chan、Roy G. Smith、Arthur A. Patchett
DOI:10.1016/s0960-894x(98)00103-6
日期:1998.4
A series of C-terminus capped dipeptides and tripeptides was synthesized as growth hormone (GH) secretagogues. Among them, tripeptide Aib-D-Trp-D-homoPhe-OEt showed low nanomolar activity in the rat pituitary assay. Thus, we have demonstrated that the GH secretagogue activity of the hexa- hepta-GH releasing peptides can be mimicked at the tripeptide level. (C) 1998 Elsevier Science Ltd. All rights reserved.