Reaction of methyl N-Boc-N-phenoxycarbonylglycinate with various aldehydes afforded the corresponding cis-4,5-oxazolidinone derivatives, which were effectively converted to (E)-α,β-didehydroamino acids by means of a base. Furthermore, N-deprotection of the oxazolidinone derivatives and subsequent coupling reaction with Boc-amino acid furnished the corresponding dipeptides, which were transformed to dipeptide containing α,β-didehydroamino acid with high E selectivity.
Synthesis of new organothiophosphorus insectoacaricides containingN-acylated amino acid fragments
作者:A. E. Shipov、G. K. Genkina、G. V. Zhdanova、P. V. Petrovskii、S. A. Roslavtseva、I. N. Sazonova、O. V. Sundukov、L. S. Golovkina、R. I. Volkova、Yu. S. Kagan、E. A. Ershova、T. A. Mastryukova、M. I. Kabachnik
DOI:10.1007/bf00698251
日期:1994.7
(methyl)thio- and -dithiophosphonates and N-alkoxycarbonyl-N-chloromethylglycine or -β-alanine esters and by treatment ofO-alkyl (methyl)dithiophosphonoates andN-acylated amino acids or their esters with paraform in the presence of HCl were developed. The compounds obtained exhibit high insectoacaricide activity and selectivity.
Polymers from Amino acids: Development of Dual Ester-Urethane Melt Condensation Approach and Mechanistic Aspects
作者:S. Anantharaj、M. Jayakannan
DOI:10.1021/bm300697h
日期:2012.8.13
molecular weight poly(ester-urethane)s. The occurrence of the dual ester-urethane process and the structure of the new poly(ester-urethane)s were confirmed by 1H and 13C NMR. The new dual ester-urethane condensation approach was demonstrated for variety of amino acids: glycine, β-alanine, l-alanine, l-leucine, l-valine, and l-phenylalanine. MALDI-TOF-MS end group analysis confirmed that the amino acid monomers
开发了一种新的用于生物单体-氨基酸的双酯-氨基甲酸酯熔融缩合方法,以在环保且无溶剂的聚合方法下合成新型热塑性聚合物。通过定制的合成方法,将天然丰富的1-氨基酸转化为双官能的酯-氨基甲酸酯单体。这些氨基酸单体与市售的二醇在熔融条件下直接缩聚产生高分子量的聚(酯-氨基甲酸酯)。通过1 H和13 C NMR证实了双酯-氨基甲酸酯工艺的出现和新型聚(酯-氨基甲酸酯)的结构。新的双酯-氨基甲酸酯缩合方法可用于多种氨基酸:甘氨酸,β-丙氨酸,l-丙氨酸,1-亮氨酸,1-缬氨酸和1-苯丙氨酸。MALDI-TOF-MS端基分析证实了该氨基酸单体在熔融聚合条件下是热稳定的。通过模型反应研究了熔融过程的机理和缩聚反应动力学,发现氨基酸单体在通过聚合温度或催化剂可以选择性地反应其酯和氨基甲酸酯官能度的意义上是非常特殊的。新型聚合物在水性或有机溶剂中可自组织为β-折叠材料,其热性能(如玻璃化转变温度和结晶度)可通
Catalysts and temperature driven melt polycondensation reaction for helical poly(ester-urethane)s based on natural L-amino acids
作者:Santhanaraj Anantharaj、Manickam Jayakannan
DOI:10.1002/pola.27970
日期:2016.4.15
Theoretical studies revealed that the carbonyl carbon in ester possessed low electron density compared to the carbonyl carbon in urethane which driven the thermo‐selective polymerization process. Optical purity of the L‐amino acid residues in the melt polycondensation process was investigated using D‐ and L‐isomers and the resultant products were analyzed by chiral‐HPLC and CD spectroscopy. CD analysis