Hydrochloric Acid → 1-Bromo-4-cyclopropoxybenzene

Participants

Reaction Steps

The following cyclopropanation was conducted according to the description in the document (Tetrahedron Lett., (1998), 39, 8621-8624). Diethylzinc (1.0 M n-hexane solution, 250 mL, 250 mmol) was added to methylene chloride (250 mL), and a methylene chloride (120 mL) solution of trifluoroacetic acid (19.2 mL, 249 mmol) was added thereto under ice-cooling over 100 minutes. The mixture was further stirred for 1 hour. Then, a methylene chloride (100 mL) solution of chloroiodomethane (20.1 mL, 250 mmol) was added thereto under ice-cooling over 40 minutes. At the same temperature, a methylene chloride (120 mL) solution of 1-bromo-4-(vinyloxy)benzene (32.8 g, 165 mmol) prepared in Example 5 (5b) was added thereto over 20 minutes. The resulting mixture was stirred at room temperature for 1.5 hours. To the reaction solution was added 0.1 N hydrochloric acid (400 mL). The mixture was stirred for 30 minutes, filtered through Celite, and further washed with n-hexane (200 mL). The filtrate and the n-hexane washing solution were combined, and the organic layer was washed with 0.1 N hydrochloric acid (100 mL) and saturated brine (100 mL) containing about 1 g of sodium sulfite twice. This organic layer was dried over anhydrous magnesium sulfate, and then the solvent was evaporated to give 36.0 g of 1-bromo-4-(cyclopropyloxy)benzene (yellow oil).

Provenance & Evidence