2-Nitrobenzenesulfonyl chloride → Ethyl 7,7-dimethyl-5-(2-nitrophenylsulfonyl)-4,5,6,7-tetrahydrothieno[3,2-c]pyridine-2-carboxylate

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Reaction Steps

A solution of ethyl 7,7-dimethyl-4,5,6,7-tetrahydrothieno[3,2-c]pyridine-2-carboxylate (20.5 g, 0.074 mol) and DIPEA (42.8 g, 0.37 mol) in DCM (400 mL) was cooled to 0° C. 2-nitrobenzene-1-sulfonyl chloride (17.3 g, 0.078 mol) was then added and the reaction mixture was allowed to warm to room temperature overnight. The crude reaction solution was applied directly to a silica gel column and purified (10-20% EtOAc/hexane) to afford product (27.6 g, 88%). 1H NMR (400 MHz, CDCl3) δ 7.98 (dd, J=4.8, 2.4 Hz, 1H), 7.64-7.68 (m, 2H), 7.57 (dd, J=4.4, 2.4 Hz, 1H), 7.37 (s, 1H), 7.19 (s, 1H), 4.33 (s, 2H), 4.25 (q, J=7.2 Hz, 2H), 3.33 (s, 2H), 1.31 (s, 6H), 1.19 (t, J=7.2 Hz, 3H),

Provenance & Evidence