Tert-Butylamine → N-tert-Butyl-5,5-dimethyl-5,6-dihydro-4H-cyclopenta[b]thiophene-2-carboxamide

Participants

Reaction Conditions

Reaction Steps

A suspension of 131d (12.0 g, 61.0 mmol) in SOCl2 (80 mL) was heated at 65° C. for 2 h. The reaction mixture was concentrated under reduced pressure. See FIG. 15. The residue was diluted with dichloromethane (20 mL), which was added to the solution of 2-methylpropan-2-amine (4.45 g, 61.0 mmol) and triethylamine (18.0 g, 180 mmol) in dichloromethane (180 mL). The resulting mixture was stirred for 16 h and diluted with dichloromethane (200 mL). It was washed with water (3×50 mL), dried over anhydrous Mg2SO4, filtered, and evaporated under reduced pressure to afford 131e (15.0 g, 97%) as a yellow solid. MS-ESI: [M+H]+ 252.0

Provenance & Evidence