Asymmetric allylic substitution reactions of 2-substituted 2-cycloalkenyl carbonates using 9-PBN coordinated palladium
摘要:
2-Substituted 7-cycloalkenyl carbonates are suitable substrates for asymmetric allylic substitution reaction using 9-PBN coordinated palladium, producing the allylic substituted products with high enantiomeric excess. (C) 2001 Elsevier Science Ltd. All rights reserved.
Palladium-Catalyzed Allylic Amination Using Aqueous Ammonia for the Synthesis of Primary Amines
作者:Takashi Nagano、Shu̅ Kobayashi
DOI:10.1021/ja900328x
日期:2009.4.1
Palladium-catalyzed allylic amination using aqueous ammonia for the preparation of primary amines has been realized. It is noteworthy that the use of aqueous ammonia is essential and that ammonia gas did not react at all. The first catalytic asymmetric synthesis using aqueous ammonia as a nitrogen source has also been demonstrated.
A Pd-catalyzed asymmetric allylic amination using aspartic acid derived P-chirogenic diaminophosphine oxides (DIAPHOXs) is described. Asymmetric allylic amination of both linear and cyclic substrates proceeded at room temperature to give the chiral allylic amines in 72-99% ee.
Pd-catalyzed asymmetric allylic aminations with aromatic amine nucleophiles using chiral diaminophosphine oxides: DIAPHOXs
Asymmetric allylic aminations with aromatic amine nucleophiles using Pd-DIAPHOX catalyst systems are described. The asymmetric allylic aminations of various allylic carbonates proceeded using 2-5 mol % of the catalyst and BSA, providing the corresponding N-aryl chiral allylic amines in up to 99% ee for cyclic substrates, and in up to 97% ee for acyclic substrates. (C) 2008 Elsevier Ltd. All rights reserved.