Synthesis and D2-like binding affinity of 4,5-dihydro-1H-benzo[g]indole-3-carboxamide derivatives as conformationally restricted 5-phenyl-pyrrole-3-carboxamide analogs
摘要:
A series of 4,5-dihydro-1H-benzo[g]-indole-3-carboxamide derivatives 2a-g were synthesized as conformationally restricted analogs of the dopamine D-2-like 5-phenylpyrrole-3-carboxamide ligands and evaluated for their affinity for the dopamine D-2-like receptors. In this series, N3-[(1-ethyltetrahydro-1H-2-pyrrolyl)methyl]-4,5-dihydro-1H-benzo[g]indole-3-carboxamide (2a) showed the highest affinity for D-2-like receptors (IC50 = 160 nM). Replacement of the N-(1-ethyl-2-pyrrolidinyl)methyl side chain with a 2-(N,N-diethylamino)ethyl or a 1-benzyl-4-piperidinyl group (2b, 2d) decreased affinity for the D-2-like receptor. The other compounds tested were found to be devoid of D-2-like binding affinity. (C) 1998 Elsevier Science S.A. All rights reserved.
A consecutive 2-step synthesis of N-unprotected polysubstituted indoles bearing an electron-withdrawing group at the C-3 position from readily available nitroarenes is reported. The protocol is based on the [3,3]-sigmatropic rearrangement of N-oxyenamines generated by the DABCO-catalyzed reaction of N-arylhydroxylamines and conjugated terminal alkynes, and delivers indoles endowed with a wide array
A simple and straightforward method for the preparation of indole-3-carboxylic acids was discovered through the direct carboxylation of indoles with atmospheric pressure of carbon dioxide (CO2) under basic conditions. The key for the reaction was found to be the use of a large excess of LiO'Bu as a base to suppress the undesired decarboxylation side reaction.
Lithium tert-Butoxide-Mediated Carboxylation Reactions of Unprotected Indoles and Pyrroles with Carbon Dioxide
作者:Shū Kobayashi、Woo-Jin Yoo、Thanh V. Q. Nguyen、Montse Guiteras Capdevila
DOI:10.3987/com-14-s(k)94
日期:——
Unprotected indoles and pyrroles were found to undergo base-mediated carboxylation reactions under ambient pressure of carbon dioxide. It was found that this transition metal-free carboxylation reaction proceeded smoothly with the use of a large excess of (LiOBu)-Bu-t.
A New Method for the Synthesis of 3-Substituted Indoles
Starting from readily accessible nitrones and electron-deficient acetylenes, a highly efficient and versatile synthetic protocol for 3-substituted indoles has been developed.
Pinna, Gerard Aime; Pirisi, Maria Antonietta; Paglietti, Giuseppe, Journal of Chemical Research, Miniprint, 1990, # 11, p. 2777 - 2795
作者:Pinna, Gerard Aime、Pirisi, Maria Antonietta、Paglietti, Giuseppe