One pot synthesis and conformation of N-t-butyloxycarbonyl, O-Phenacyl derivatives of proline and other secondary amino acids
作者:John Hondrelis、Greg Lonergan、Stavros Voliotis、John Matsoukas
DOI:10.1016/s0040-4020(01)85437-5
日期:1990.1
Proline, 4-hydroxyproline, azetidine-2-carboxylic acid, pipecolic acid and proline containing dipeptides were converted to N-t-butyloxycarbonyl, O-phenacyl derivatives in a one pot synthesis. 1H - and 13C -NMR spectroscopy of certain derivatives (Boc-Pro-PE, Boc-4Hyp-PE, Boc-Pro-4BrPE and Boc-Pip-PE) in CDC13 solution reveal the presence of cis-trans isomers in almost equal quantities. On the contrary
在一锅合成中,将脯氨酸,4-羟基脯氨酸,氮杂环丁烷-2-羧酸,胡椒酸和含脯氨酸的二肽转化为Nt-丁氧基羰基,O-苯甲酰基衍生物。CDC1 3溶液中某些衍生物(Boc-Pro-PE,Boc-4Hyp-PE,Boc-Pro-4BrPE和Boc-Pip-PE)的1 H-和13 C -NMR光谱揭示了顺式-反式异构体的存在几乎相等的数量。相反,1 H和13氮杂环丁烷-2-羧酸的Nt-丁氧基羰基苯甲酸酯的13 C-NMR谱表明仅存在一种异构体。类似地,在溶液中仅观察到一种氨基甲酸酯异构体,用于保护的C端血管紧张素II二肽,Nt-Boc-Pro-Phe-PE和Nt-Boc-Pro-Ile-PE。所有的苯甲酰基衍生物均表现出归因于空间因素的磁不对称性。