We report the synthesis and biological evaluation of a series of new tricyclic analogs of the hormone melatonin, which act as probes of the constraints at the hormone's receptor site with regard to the lower N1-C2 region of the indole moiety of melatonin. Three of the new compounds, N-[2-(2-methoxy-6,7,8,9-tetrahydropyrido[1,2-a]indol-10-yl)ethyl]acetamide (9), and the respective propionamide 10 and butyramide 11, are as potent as melatonin in the Xenopus laevis melanophore model. (C) 2001 Elsevier Science S.A. All rights reserved.
Convenient KI-catalyzed regioselective synthesis of 2-sulfonylindoles using water as solvent
作者:Hongjie Li、Xiaolong Wang、Jie Yan
DOI:10.1039/c7nj00474e
日期:——
A convenient procedure is developed for the preparation of 2-sulfonylindoles fromindoles and sodium sulfinates catalyzed by KI in water. This environmentally benign 2-sulfonylation of indoles proceeds efficiently under mild conditions, affording the products with high regioselectivity and in moderate to good yields.
A facile and general method for regioselective C2 sulfonylation reaction of indoles mediated by iodine is described. The 2-sulfonylated products were obtained up to 96% yield under mild reaction conditions (room temperature, 2 h).