XY–ZH systems as potential 1,3-dipoles. Part 1. Background and scope
作者:Ronald Grigg、H. Q. Nimal Gunaratne、James Kemp
DOI:10.1039/p19840000041
日期:——
XY–ZH Systems are considered in general terms and divided into four classes according to the number of constituent atoms that possess lone-pair electrons. Those systems in which the central Y atom possesses a lone pair are shown to be capable of participating in formal 1,2-H shifts generating 1,3-dipolar species. The scope of the reaction, including its possible relevance to the biochemistry of pyridoxal
X Y–ZH系统被视为通用术语,根据拥有孤对电子的组成原子的数量分为四类。中心Y原子具有孤对的那些系统显示出能够参与形成1,2-H移位的正式1,2-H移位,从而产生1,3-偶极物种。讨论了反应的范围,包括其可能与吡ido醛酶生物化学的相关性,并通过速率数据证明了一系列苯基甘氨酸和丙氨酸甲酯的芳基亚胺环加成N-苯基马来酰亚胺的速率对结构的影响。
Ag(I)/CAAA-Amidphos Complex Catalyzed Asymmetric 1,3-Dipolar Cycloaddition of Acrylates for the Formal Synthesis of (+)-Ibophyllidine
In this work, we introduced a multifunctional Ag(I)/CAAA-amidphos complex catalyzed asymmetric 1,3-dipolarcycloaddition of acrylates with α-imino esters, affording a series of 2,4,5-trisubstituted endo-pyrrolidines in good yields (up to 97%) with high enantioselectivities (up to 98% ee). Meanwhile, the catalytic system was also applied in the three-component one-pot reaction of α-imino esters formed
The Reaction of Pyruvic Acid with Amines and Aminoesters Reexamined. Preliminary communication
作者:Silvia Bradamante、Silvana Colombo、Giorgio A. Pagani、Stefano Roelens
DOI:10.1002/hlca.19810640220
日期:1981.3.18
Phenylglycine esters react with pyruvic acid to give α-methylsuccinic amides 9 instead of the expected Schiff bases 8, analogously to p-anisidine but unlike aniline.
The l -tert-leucine-derived AmidPhos/silver(I) catalytic system has been developed for the asymmetric [3+2] cycloaddition of azomethineylides with electronic-deficient alkenes with or without Et3N. Under optimal conditions, highly functionalized endo-4-pyrrolidines were obtained with modest to high yields (up to 99% yield) and enantioselectivities (up to 98% ee).
Phosphorus-containing Aminocarboxylic Acids: XIV. Synthesis of Analogs of α-Substituted Glutamic Acid
作者:I. V. Saratovskikh、V. V. Ragulin
DOI:10.1007/s11176-005-0371-2
日期:2005.7
Addition of Schiff bases derived from amino acid esters to appropriate vinylphosphoryl compounds, followed by hydrolysis of the adducts formed gives a series of new α-alkylated phosphorus-containing α-aminocarboxylic acids, viz. phosphonic and phosphinic analogs of glutamic acid.