Imidazole → (3-(tert-Butyl-dimethyl-silanyloxy)-prop-1-ynyl]-4,5,6,7-tetrahydro-benzo[b]thiophene-2-carboxylic acid methyl ester

Participants

Reaction Steps

To a solution of methyl 3-(3-hydroxyprop-1-yn-1-yl)-4,5,6,7-tetrahydrobenzo[b]thiophene-2-carboxylate (8.5 g, 34 mmol) in Dichloromethane (DCM) (50 mL) was added 1H-imidazole (5.8 g, 85 mmol) and TBSCl (7.7 g, 50.9 mmol). The mixture was stirred at room temperature for 2 h. The reaction mixture was washed with water, brine, dried over Na2SO4 and concentrated to dryness. The residue was purified by chromatography column on silica gel chromatography eluted with PE:EtOAc=50:1˜20:1 to afford title product (11.9 g, 96% yield). 1HNMR: (400 MHz, CDCl3) δ 0.161 (s, 6H), 0.929 (s, 9H), 1.79-1.85 (m, 4H), 2.60-2.63 (m, 2H), 2.72-2.75 (m, 2H), 3.85 (s, 3H), 4.62 (s, 2H).

Provenance & Evidence