Boron trifluoride etherate → HCID 13290035, compound

Participants

Reaction Steps

A mixture of 14.7 g of 2-cyclohexyl-6,7-dichloro-2,3-dihydro-3-hydroxy-5-methoxybenzo[b]thiophene, 90 ml of glacial acetic acid and 21 ml of boron trifluoride etherate is warmed on a steam bath until it becomes homogeneous and then stirred for one hour. To the reaction mixture is added 100 ml of cold 10% sodium hydroxide solution. The mixture is further basified with 50% sodium hydroxide solution and extracted with three 230 ml-portions of ether. The organic extracts are dried over anhydrous magnesium sulfate, filtered and evaporated. Recrystallization of the residue from ether-hexane gives 9.0 g of 6,7-dichloro-2-cyclohexyl-5-methoxybenzo[b]thiophene as off-white crystals, mp 60°.

Provenance & Evidence