The addition of amines to diisobutylaluminum-imine complexes. Preparation of NPS R-568 Hydrochloride
摘要:
A facile procedure for the preparation of secondary and tertiary amines from nitriles has been developed. The addition of amines to diisobutylaluminum-imine complexes derived by treating nitriles with DIBAL-H was found to proceed in moderate to good yields and was used to prepare NPS R-568 (1) hydrochloride, a potent calcium receptor agonist. (C) 1998 Elsevier Science Ltd. All rights reserved.
complex presented higher reactivity in the transferhydrogenation (TH) of ketones in 2-propanol. Experimentally, it was established that both the benzimidazole and amine N–H proton played a vital role in the enhancement of the catalytic activity. Utilizing this system a wide range of aldehydes and ketones were reduced efficiently. Notably, the TH of several imines, as well as chemoselective reduction of
First Efficient Two-Step/One-Pot Zirconium (IV)isopropoxide–Mediated Reductive Amination of Carbonyl Compounds
作者:Cyril Pieri、Jean Michel Brunel
DOI:10.2174/1570180812666141215215120
日期:2015.5.7
An efficient method for the synthesis of various primary and secondary amines through a zirconium(IV) isopropoxide–mediated reductive amination reaction of aldehydes and ketones is reported. A series of different aldehydes, ketones and amines were used leading to the expected amino products in moderate to excellent yields. The mechanistic rationale of this reaction has been postulated through the formation
One-Pot Reductive Mono-<i>N</i>-alkylation of Aniline and Nitroarene Derivatives Using Aldehydes
作者:Eunyoung Byun、Bomi Hong、Kathlia A. De Castro、Minkyung Lim、Hakjune Rhee
DOI:10.1021/jo701503q
日期:2007.12.1
One-potreductivemono-N-alkylation of aniline and nitroarene derivatives using various aldehydes by Pd/C catalyst in aqueous 2-propanol solvent with ammonium formate as in situ hydrogen donor is illustrated. The reaction proceeded smoothly and selectively with excellent yield at room temperature. Our protocol presents a facile, economical, and environmentally benign alternative for reductive amination
Tungsten‐Catalyzed Direct
<i>N</i>
‐Alkylation of Anilines with Alcohols
作者:Xiao‐Bing Lan、Zongren Ye、Chenhui Yang、Weikang Li、Jiahao Liu、Ming Huang、Yan Liu、Zhuofeng Ke
DOI:10.1002/cssc.202002830
日期:2021.2.5
tungsten‐catalyzed N‐alkylation reaction of anilines with primary alcohols via BH/HA. This phosphine‐free W(phen)(CO)4 (phen=1,10‐phenthroline) system was demonstrated as a practical and easily accessible in‐situ catalysis for a broad range of amines and alcohols (up to 49 examples, including 16 previously undisclosed products). Notably, this tungsten system can tolerate numerous functional groups,
for the alkylation of amines using alcohols as alkylating agents. Catalysts 1, 2 and 3a gave excellent yields of up to 99% for the alkylation of various amines using benzylic and aliphatic alcohols at 130 °C for 18 h undersolventlessconditions. Catalyst 3a bearing both phosphine and carbene ligands gave excellent yields of up to 98% for the synthesis of heterocyclic amines by double alkylation of primary