Synthesis of 3-amino-2-(3-indolyl)propanol and propanoate derivatives and preliminary cardiovascular evaluation in rats

Preparation of O-Methyl Substituted 2-Oxofuro- and 2-Oxopyrrolidinoindolines by Reductive Lactonization of Oxindol-3-Ylacetic Acids

A practical procedure for the preparation of O-methyl substituted 3a,8-dialkyl-2-oxofuroindolines is described. Reductive lactonization of the corresponding oxindol-3-ylacetic acids provides a route for the formation of this class of compounds. Further transformation of 2-oxofuroindolines into 2-oxopyrrolidinoindolines, and then to pyrrolidinoindolines demonstrates their versatility as key intermediates in natural products synthesis. The results of single-crystal X-ray crystallographic analyses are given for five of the studied compounds.

Total synthesis of indole-3-acetonitrile-4-methoxy-2-C-β-D-glucopyranoside. Proposal for structural revision of the natural product

Indole-3-acetonitrile-4-methoxy-2-C-β-D-glucopyranoside (1), a novel C-glycoside from Isatis indigotica with important cytotoxic activity, has been prepared in ten steps from ethynyl-β-C-glycoside 3 and 2-iodo-3-nitrophenyl acetate 6. Key steps in the synthesis include a Sonogashira coupling and a CuI-mediated indole formation. NMR spectroscopic data for synthetic 1 differs from that reported for the natural product. A revised structure for the natural product, containing an alternate carbohydrate substituent, is proposed.

Synthesis of N1-phenethyl substituted indole derivatives as new melatoninergic agonists and antagonists

The potency of new indolic N1-phenethyl substituted melatoninergic ligands with and without methyl groups in the alpha and beta position of the alkanamidoethyl side chain was examined using the pigment aggregation response in a clonal line of Xenopus laevis melanophores. The non 5-OMe substituted compounds, 8a--e, are all weak antagonists while introduction of the 5-OMe group, 9a--e, increases both agonist and antagonist activity except for 9c (R=C3H7), which is only an agonist and 9e (R=c-C4H7), which is only an antagonist. Introduction of an alpha-methyl group into the 5-OMe derivatives, 14a-e, reduces the agonist potency while introduction of a beta-methyl group has only a small effect on either the agonist or antagonist potency. Double beta-methyl substitution of the 5-OMe derivatives, 20a--e, generally increases the agonist potential (20c, R=C3H7 is the most potent agonist of the compounds described) and decreases the antagonist potency, except for 20a (R=CH3), which is the most potent antagonist of this series of compounds.