芳基-α-氨基酯与亲电烯烃的反应以生成 Michael 型加成化合物,使用几种膦作为有机催化剂进行了优化。由于产生了几种最终化合物,包括来自 1,3-偶极环加成反应的化合物,因此转化非常复杂。因此,反应条件的选择是一项非常复杂的任务,而丙烯酸体系的缓慢添加对于完成该过程非常重要。研究了起始亚氨基酯结构成分的变化以及其他贫电子烯烃的膨胀。在大多数情况下,粗产品的纯度高于 90%,无需任何纯化。根据参考书目和实验结果,详细介绍了一种合理的机制。焦谷氨酸实体的合成,在亚氨基还原和环化后,以高产率进行。此外,亚氨基在酸性介质下的水解代表了谷氨酸替代物的直接途径。
Michael adducts of imines of α-aminoacidesters are converted into a mixture of two stereoisomeric pyrrolidines by benzyltrimethylammonium methoxide (BTAM) apparently by a 5-endo-trigcyclisation.
Electroreductive Intramolecular Coupling of Aromatic Imino Esters: Is Four-Membered Cyclization Much More Favorable than Six-Membered Cyclization?
作者:Naoki Kise、Yuuki Hirano、Yoshi Tanaka
DOI:10.1021/ol053144x
日期:2006.3.1
electroreduction of an aromatic imino ester prepared from (S)-glutamic acid in the presence of chlorotrimethylsilane and triethylamine afforded a four-membered cyclized product, a mixed ketal of cis-2,4-disubstituted azetidine-3-one, stereospecifically. Calculations for the transition states by the DFT method support the predominant formation of the azetidine. The electroreduction of an aromatic imino ester prepared
Stereoselective synthesis of functional derivatives of 2-(2-carboxyethyl)pyrrolidine-2-carboxylic acid
作者:K. V. Kudryavtsev、N. V. Nukolova、O. V. Kokoreva、E. S. Smolin
DOI:10.1134/s1070428006030134
日期:2006.3
Azomethine ylides generated from dimethyl 2-(arylmethylideneamino)pentanedioates by the action of AgOAc and Et3N reacted with dipolarophiles in regio- and stereoselective fashion to form 5-aryl-2-(2-carboxyethyl)pyrrolidine-2-carboxylic acid derivatives. 1,3-Dipolar cycloaddition of divinyl sulfone to the azomethine ylide generated from the Schiff base derived from methyl (S)-2-phthalimido-4-oxobutanoate and dimethyl glutamate gave chiral simplified kaitocephalin analogs.
MKHAIRI A.; HAMELIN J., TETRAHEDRON LETT., 27,(1986) N 37, 4435-4436
作者:MKHAIRI A.、 HAMELIN J.
DOI:——
日期:——
GRIGG, RONALD;KEMP, JAMES;MALONE, JOHN, TETRAHEDRON, 44,(1988) N 17, C. 5361-5374