N-Methylcarbazole-3-carboxylic Acid and Its Amides
摘要:
N-Methylcarbazole-3-carboxylic acid was synthesized from N-methyl-2-amino-4-carboxydiphenylamine through the corresponding diazo compound by a modified Pschorr procedure. The acid was converted into N-methylcarbazole-3-carbonyl chloride which was treated with amines containing benzo- and aza-crown ether moieties, as well as with 3-(dimethylamino)propylamine, to obtain the respective N-substituted amides.
Direct Synthesis of Ketones from Methyl Esters by Nickel‐Catalyzed Suzuki–Miyaura Coupling
作者:Yan‐Long Zheng、Pei‐Pei Xie、Omid Daneshfar、Kendall N. Houk、Xin Hong、Stephen G. Newman
DOI:10.1002/anie.202103327
日期:2021.6.7
direct conversion of alkyl esters to ketones has been hindered by the sluggish reactivity of the starting materials and the susceptibility of the product towards subsequent nucleophilic attack. We have now achieved a cross-coupling approach to this transformation using nickel, a bulky N-heterocyclic carbene ligand, and alkyl organoboron coupling partners. 65 alkylketonesbearing diverse functional groups
烷基酯向酮的直接转化受到起始材料缓慢的反应性和产物对随后亲核攻击的敏感性的阻碍。我们现在已经使用镍、一种庞大的 N-杂环卡宾配体和烷基有机硼偶联伙伴实现了这种转化的交叉偶联方法。用这种方法合成了 65 个带有不同官能团和杂环支架的烷基酮。对于带有易于被 Ni 裂解的其他键的多功能底物的 C(酰基)-O 键活化,观察到催化剂控制的化学选择性,包括芳醚、芳基氟和 N-Ph 酰胺官能团。密度泛函理论计算为 Ni 0 /Ni II提供了机械支持 催化循环,并证明稳定的大催化剂和底物之间的非共价相互作用对反应的成功至关重要。
Thermal 1,6-Electrocyclization Reactions of Acceptor-Substituted 2,3-Divinyl-1H-indoles Yielding Functionalized Carbazoles
作者:Ulf Pindur、Reinhard Adam
DOI:10.1002/hlca.19900730408
日期:1990.6.20
Three new synthetic procedures for and thermal 1,6-electrocyclizations of acceptor-substituted2,3-divinyl-1H-indoles leading to functionalizingcarbazoles are described. The scope and limitations as well as some mechanistic aspects of the methodologies are discussed. The key strategies employed include Pd(II)-catalyzed coupling and Wittig procedures.
First Inverse Electron-Demand Diels–Alder Methodology of 3-Chloroindoles and Methyl Coumalate to Carbazoles
作者:Tezcan Guney、Jennifer J. Lee、George A. Kraus
DOI:10.1021/ol403733n
日期:2014.2.21
The first successful inverse electron-demand Diels–Alder has been demonstrated with the 2-pyrone methylcoumalate in conjunction with substituted indoles. Utilizing 1-alkyl-3-chloroindoles as the electron-rich dienophile efficiently generates carbazoles without the need for additional metal catalysts. Through a thermal, one-pot Diels–Alder/decarboxylation/elimination domino sequence, access to a class
An Improved Synthesis of Carbazoles<i>via</i>Domino Reaction of<i>N</i>-Protected-2-methylindoles with DMF-DMA/DMA-DMA
作者:Radhakrishnan Sureshbabu、Arasambattu K. Mohanakrishnan
DOI:10.1002/jhet.899
日期:2012.7
An efficient synthesis of carbazole analogs has been achieved via interaction of N‐protected‐2‐methylindoles with N,N‐dimethylformamide dimethylacetal as well as N,N‐dimethylacetamide dimethylacetal in the presence of pyrrolidine or 1,4‐diazabicyclo(2.2.2)octane (DABCO).
Narasimhan, N. S.; Kusurkar, R. S., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1983, vol. 22, # 9, p. 846 - 849