Sodium hydride → Ethyl 2-(cyclopropylmethyl)-1,3-dithiane-2-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a suspension of NaH (95%, 2.8 g, 111 mmol) in dry toluene (120 mL) stirring at 0° C. was dropwise added, over 10 minutes, a solution of bromomethylcyclopropane (15 g, 111 mmol), and ethyl 1,3-dithiane-2-carboxylate (17.77 g, 92.58 mmol) in dry DMF (40 mL). The ice bath was removed and the solution was stirred overnight at rt. Water was added to the solution and the phases were separated. The organic phase was dried over MgSO4, then evaporated to give 19.6 g (50%) of ethyl 2-(cyclopropylmethyl)-1,3-dithiane-2-carboxylate, which was used in the next step without purification. 1H NMR (CDCl3): δ 4.26 (2H, q, J=7.2 Hz), 3.30-3.23 (2H, m), 2.69-2.64 (2H, m), 2.16-2.11 (1H, m), 1.96 (2H, d, J=6.8 Hz), 1.91-1.81 (1H, m), 1.34 (3H, t, J=7.2 Hz), 0.93-0.86 (1H, m), 0.52-0.47 (2H, m), 0.20-0.16 (2H, m).

Provenance & Evidence