CuI / 4-羟基-1-脯氨酸催化的芳基溴化物与N- Boc肼的偶合反应在DMSO中于80°C进行,得到N-芳基酰肼。当使用芳基碘化物时,该反应在50℃下完成并且不需要配体。在CuI / 4-羟基-1-脯氨酸的催化下,氨水与芳基溴化物的偶联反应在50℃下顺利进行,得到伯芳基胺。在这种情况下,发现K 2 CO 3是比Cs 2 CO 3更好的碱。这些过程允许组装N带有多种官能团的-芳基酰肼和伯芳基胺包括羟基,胺基,三氟甲基,酯基,硝基和酮。
Expedient synthesis of indoles from N-Boc arylhydrazines
作者:Young-Kwan Lim、Cheon-Gyu Cho
DOI:10.1016/j.tetlet.2004.01.011
日期:2004.2
The readily available N-Boc arylhydrazines undergo efficient Fischer cyclizations to provide the indoles in good yields, when reacted with enolizable ketones.
MUSCARINIC RECEPTOR AGONISTS, COMPOSITIONS, METHODS OF TREATMENT THEREOF, AND PROCESSES FOR PREPARATION THEREOF-176
申请人:Jin Shujuan
公开号:US20090221642A1
公开(公告)日:2009-09-03
Compounds of Formula 1, or pharmaceutically acceptable salts thereof:
wherein X, R
1
, R
2
, R
3
, R
4
, R
5
, n, m, and p are as defined in the specification as well as salts and pharmaceutical compositions including the compounds are prepared. They are useful in therapy, in particular in the management of pain.
A convenient method for the intermolecular N-arylation of hydrazides with aryl halides in the presence of a palladium catalyst, a MOP-type ligand, and Cs2CO3 is reported. The reaction gives coupling products in good to excellent yields and has a high tolerance towards a wide spectrum of functional groups.
Enantioselective Synthesis of N–N Amide–Pyrrole Atropisomers via Paal–Knorr Reaction
作者:Yuanlin Wei、Fan Sun、Guofeng Li、ShiYu Xu、Ming Zhang、Liang Hong
DOI:10.1021/acs.orglett.3c03280
日期:2024.3.29
we present a highly efficient enantioselective synthesis of monoheteroaryl N–N atropisomers via an asymmetric Paal–Knorr reaction, affording a diverse array of N–N amide–pyrrole atropisomers with excellent enantioselectivities. Gram-scale synthesis and post-transformations of the product demonstrated the synthesis utility of this method. Racemization experiments confirmed the configurational stability
An efficient copper-catalyzed carbon-nitrogen bond formation is described. The copper(I) complex with commercially available 2-picolinic acid ligand was found to be effective in N-arylation of N-Boc-hydrazine. This methodology offers a regioselective N-arylation of hydrazides using a variety of substituted aryl iodides. (C) 2008 Elsevier Ltd. All rights reserved.