Regioselective synthesis of aryl hydrazides by palladium-catalyzed coupling of t-butylcarbazate with substituted aryl bromides
摘要:
Substituted aryl bromides are coupled with t-butylcarbazate in the presence of a palladium catalyst and base to afford regioselectively, the corresponding amidation product or amination product depending upon the position of the substituents on the aryl bromide. (C) 1999 Elsevier Science Ltd. All rights reserved.
A compound of general Formula (I) having histone deacetylase (HDAC) and/or Cyclin-dependent kinase (CDK) inhibitory activity, a pharmaceutical composition comprising the compound, and a method useful to treat diseases using the compound.
CuI/4-Hydro-<scp>l</scp>-proline as a More Effective Catalytic System for Coupling of Aryl Bromides with <i>N</i>-Boc Hydrazine and Aqueous Ammonia
作者:Liqin Jiang、Xu Lu、Hui Zhang、Yongwen Jiang、Dawei Ma
DOI:10.1021/jo9006738
日期:2009.6.19
CuI/4-hydroxy-l-proline-catalyzed coupling of aryl bromides and N-Boc hydrazine takes place in DMSO at 80 °C to give N-aryl hydrazides. When aryl iodides are employed, this reaction completes at 50 °C and no ligand is required. Under the catalysis of CuI/4-hydroxy-l-proline, the coupling reaction of aqueousammonia with aryl bromides proceeds smoothly at 50 °C to afford primary arylamines. In this
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。
Substituted Pyrazalones
申请人:Lee Wen-Cherng
公开号:US20100056505A1
公开(公告)日:2010-03-04
The invention is related to compounds of formula (I) as antagonists of the TGFβ family type I receptors, Alk5 and/or AIk 4, compositions and methods of use. The compounds of formula (I) can be employed in the prevention and/or treatment of diseases such as fibrosis (e.g., renal fibrosis, pulmonary fibrosis, and hepatic fibrosis), progressive cancers, or other diseases for which reduction of TGFβ family signaling activity is desirable.
Continuous flow synthesis of arylhydrazines <i>via</i> nickel/photoredox coupling of <i>tert</i>-butyl carbazate with aryl halides
作者:Alejandro Mata、Duc N. Tran、Ulrich Weigl、Jason D. Williams、C. Oliver Kappe
DOI:10.1039/d0cc06787c
日期:——
Nickel/photoredox catalyzed C–N couplings of hydrazine-derived nucleophiles provide a powerful alternative to Pd-catalyzed methods. This continuous-flowphotochemical protocol, optimized using design of experiments, achieves these couplings in short residence times, with high selectivity. A range of (hetero)aryl bromides and chlorides are compatible and understanding of process stability/reactor fouling
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