Copper-Catalyzed Cross-Coupling of Imines, Acid Chlorides, and Organostannanes: A Multicomponent Synthesis of α-Substituted Amides
作者:Daniel A. Black、Bruce A. Arndtsen
DOI:10.1021/jo0503557
日期:2005.6.1
A copper-catalyzedcross-coupling of organotin reagents with imines and acid chlorides is reported. The reaction proceeds efficiently with a range of vinyl-, alkyl-, aryl- and heteroaryl-substituted organostannanes as well as a diverse set of imines of non-enolizable aldehydes. Use of chloroformates also allows for the formation of N-protected α-substituted amines. This chemistry has been applied to
[reaction: see text] Silver fluoride and cinchonaalkaloidscatalyze the diastereo- and enantioselective 1,3-dipolar cycloaddition between azomethine ylides, generated from N-alkylideneglycine esters, and acrylates to give the corresponding endo-adducts. Azomethine ylides derivedfrom aromatic and aliphatic aldehydes react in a highly diastereoselective reaction with good yields and enantioselectivities
Bifunctional AgOAc-Catalyzed Asymmetric [3 + 2] Cycloaddition of Azomethine Ylides
作者:Wei Zeng、Yong-Gui Zhou
DOI:10.1021/ol0520370
日期:2005.10.1
[reaction: see text] A bifunctional AgOAc-catalyzed asymmetriccycloaddition of azomethineylides with electronic-deficient alkenes was developed using ferrocenyloxazoline-derived N,P ligands. The reactive metal-bound azomethineylide dipole is formed by the deprotonation with acetate, and extra base is not necessary. The reactions proceed with high enantioselectivity. This method provides an efficient
Stereodivergency in Catalytic Asymmetric Conjugate Addition Reactions of Glycine (Ket)imines
作者:Hun Young Kim、Jian-Yuan Li、Sungkyung Kim、Kyungsoo Oh
DOI:10.1021/ja2100356
日期:2011.12.28
catalytic asymmetric conjugatereactions of glycine (ket)imines with nitroalkenes have been achieved using various chiral catalyst systems derivedfrom a multidentate amino alcohol (1). The stepwise nature of the [3 + 2] cycloaddition reactions of N-metalated azomethine ylides has also been demonstrated by highly enantio- and diastereoselective syntheses of exo-5 and endo-8 from the respective syn-4
Azomethine-isocyanide [3+2] cycloaddition to imidazoles promoted by silver and DBU
作者:Xiaoshan Huang、Xuefeng Cong、Pengbing Mi、Xihe Bi
DOI:10.1039/c7cc00772h
日期:——
A new silver-promoted [3+2] cycloaddition of azomethine ylides with isocyanides has been described to construct a variety of 1,2,4-trisubstituted imidazoles of vital bioactive molecules.