Counterion-Mediated Hydrogen-Bonding Effects: Mechanistic Study of Gold(I)-Catalyzed Enantioselective Hydroamination of Allenes
作者:Ji Hye Kim、Sung-Woo Park、Sae Rom Park、Sungyul Lee、Eun Joo Kang
DOI:10.1002/asia.201100135
日期:2011.8.1
A new type of counterion‐mediated syn‐addition mechanism has been presented in gold‐catalyzed enantioselectivehydroamination reactions with [(R)‐binap(AuOPNB)2] (OPNB=para‐nitrobenzoate). A combination of both hydrogen bonding and the NAu interaction efficiently controlled the challenging enantioselectivity of allenes.
两种:一种新型的抗衡离子介导的顺式加成机理已在金催化的与[[ R ] -binap(AuOPNB)2 ](OPNB =对硝基苯甲酸酯)的对映选择性加氢胺化反应中提出。氢键和NAu相互作用的结合有效地控制了烯的挑战性对映选择性。
Palladium(II)-catalyzed intramolecular 1,2-oxidation of allenes involving nitrogen nucleophiles
A series of allenic tosylamides have been prepared and shown to undergo palladium(II)-catalyzed cyclization in the presence of lithium bromide and a copper(II) salt to give pyrrolidines. Palladium-catalyzed 1,2-oxidation of allenic lactams in the presence of LiBr and p-benzoquinone was also studied. (C) 2000 Elsevier Science Ltd. All rights reserved.