Ammonium Chloride → HCID 15521111, compound

Participants

Reaction Steps

To a solution of 4.98 g (35.5 mmol) of tetrahydro-2-(2-propynyloxy)-2H-pyran in 70 mL of THF under N2 was added 14.2 mL (35.5 mmol) of 2.5 M n-butyllithium in hexane. After 15 minutes, 7.03 g (35.5 mmol) of 4-bromophenylisocyanate was added and then the reaction was allowed to warm to room temperature. Saturated aqueous ammonium chloride (20 mL) was added and the mixture extracted with 30 mL ethyl acetate three times. The combined organic extracts were dried with MgSO4, concentrated to an oil in vacuo and then chromatographed on silica with 20% EtOAc/hexane to give 7.1 g (59%) of the desired alkyne. 1H NMR (CDCl3) δ: 7.53 (br s, 1H); 7.43 (d, 2H); 7.42 (d, 2H); 4.80 (m, 1H); 4.43 (d, 1H); 4.40 (d, 1H); 3.83 (m, 1H); 3.59 (m, 1H); 1.7 (m, 6H).

Provenance & Evidence