Diisopropylethylamine → 3-ethyl-5,5-dimethyl-4,5,6,7-tetrahydro-benzo[c]thiophene-1-carboxylic acid N'-(2-ethyl-6-methyl-pyridine-4-carbonyl)-hydrazide

Participants

Reaction Steps

To a solution of 3-ethyl-5,5-dimethyl-4,5,6,7-tetrahydro-benzo[c]thiophene-1-carboxylic acid (114 mg, 0.48 mmol), 2-ethyl-6-methyl-isonicotinic acid hydrazide hydrochloride (120.5 mg, 0.48 mmol) and DIPEA (0.49 mL) in DMF (8 mL) is added TBTU (190 mg, 0.59 mmol). The mixture is stirred at rt for 15 h. The mixture is diluted with Et2O (50 mL) and extracted with 1M aq. NaOH (2×20 mL). The aq. extracts are washed with EA (2×20 mL) and the combined organic phases are dried (MgSO4), filtered and evaporated to give crude 3-ethyl-5,5-dimethyl-4,5,6,7-tetrahydro-benzo[c]thiophene-1-carboxylic acid N′-(2-ethyl-6-methyl-pyridine-4-carbonyl)-hydrazide; LC-MS: tR=0.83 min, [M+1]=400.31.

Provenance & Evidence