Methanol → HCID 178499336, compound

Participants

Reaction Steps

trans-4-Methylcyclohexyl carboxylic acid chloride (23.88 mmol) and pyridine (2.89 mL, 35.82 mmol) are added to a solution of 5-(3,3-dimethyl-but-1-ynyl)-3-(N-tert-butoxycarbonyl-piperidin-4-yl)amino-thiophene-2-carboxylic acid methyl ester from step III (5.142 g) in dry toluene (50 mL). The mixture is refluxed for 24 h, then it is brought to room temperature, and additional amount of pyridine (1.0 mL) and MeOH (5 mL) are added. Then the mixture is diluted with CH2Cl2, washed with brine, organic fraction is separated, dried over Na2SO4, and concentrated to give 5.198 g of crude 5-(3,3-dimethyl-but-1-ynyl)-3-[(trans-4-methyl-cyclohexanecarbonyl)-(N-tert-butoxycarbonyl-piperidin-4-yl)amino]-thiophene-2-carboxylic acid methyl ester containing variable amounts of 5-(3,3-dimethyl-but-1-ynyl)-3-[(trans-4-methyl-cyclohexanecarbonyl)-(piperidin-4-yl)-amino]-thiophene-2-carboxylic acid methyl ester.

Provenance & Evidence