Ethyl 3-chloro-2-oxopentanoate → 2-(1-cyclohexylmethyl-7-methoxy-1H-indol-3-yl)-5-ethyl-thiazole-4-carboxylic acid ethyl ester

Participants

Reaction Steps

A mixture of 1-(cyclohexyl)methyl-7-methoxy-1H-indole-3-carbothioic acid amide (0.227 g, 0.754 mmol) and crude 3-chloro-2-oxo-pentanoic acid ethyl ester (1.34 g, 7.52 mmol) in dimethylformamide (4 ml) was subjected to microwave irradiation for 25 min at 140° C. The reaction mixture was concentrated in vacuo and the obtained reside was purified by silica gel column chromatography eluting with 25% acetone in heptane to afford crude 2-(1-cyclohexylmethyl-7-methoxy-1H-indol-3-yl)-5-ethyl-thiazole-4-carboxylic acid ethyl ester (0.490 g). This material was used in the next step without further purification.

Provenance & Evidence