Potassium Carbonate → 3-((R)-3-Cyclohexyl-5-oxo-morpholin-4-yl)-5-(3,3-dimethyl-but-1-ynyl)-thiophene-2-carboxylic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

A heavy wall flask was charged with trans-cyclohexane diamine (623 mg, 5.5 mmol, 0.5 equiv), 3-bromo-5-(3,3-dimethyl-but-1-ynyl)-thiophene-2-carboxylic acid methyl ester (4.27 g, 14.2 mmol, 1.3 equiv), K2CO3 (3.02 g, 21.8 mmol, 2.0 equiv), CuI (1.04 g, 5.5 mmol, 0.5 equiv), 5-cyclohexyl-morpholin-3-one (2.0 g, 10.9 mmol, 1.0 equiv) and 1,4-dioxane (10.0 mL). The mixture was flushed with N2 and stirred at 110° C. for 48 hours. The mixture was filtered through celite and the filtrate was concentrated under vacuum. The residue was purified by silica gel, EtOAc/heptane 50% to give product 2.8 g (yield 50%).

Provenance & Evidence