Palladium-Catalyzed Intramolecular Hydroamination of Allenes Coupled to Aerobic Alcohol Oxidation
作者:Shuifa Qiu、Yunyang Wei、Guosheng Liu
DOI:10.1002/chem.200802381
日期:2009.3.9
Taking the air! A PdII‐catalyzed intramolecular hydroamination of allenes coupled to alcohol oxidation has been developed. This reaction is performed by using a nitrogen‐based ligand under aerobic conditions, under which the molecular oxygen is used as the terminal oxidant for the reoxidation of Pd0 species to complete the catalyticcycle.
Gold-catalyzed intramolecular hydroamination of allenes: a case of chirality transfer
作者:Nitin T. Patil、Léopold Mpaka Lutete、Naoko Nishina、Yoshinori Yamamoto
DOI:10.1016/j.tetlet.2006.04.087
日期:2006.7
The hydroamination of allenes proceeded smoothly in the presence of gold catalysts to give the corresponding 2-vinyl pyrrolidines and piperidines in high yields. The reaction is very efficient and can be carried out with only 1–5 mol % catalyst at room temperature and under extremely mild conditions. As an example of chirality transfer, it is shown that aminoallene 1a (96% ee), synthesized from (S)-(−)-1-octyn-3-ol
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.