Formic Acid → O-Desmethylvenlafaxine Formate

Participants

Reaction Steps

A mixture of O-desmethylvenlafaxine (23.9 g), 96 wt % formic acid (4.79 g) and 2B ethanol (100 mL) was evaporated to give a syrupy residue. This material was redissolved in 2 B ethanol (100 mL) and evaporated to give a solid, which upon trituration in ether (200 mL) followed by filtration and vacuum drying (18 h; 50° C.; 50 mmHg) gave 27 g of product. This material was recrystallized from a hot solution of methanol (30 mL) and acetone (400 mL), which upon cooling to room temperature followed by filtering and vacuum drying (18 h; 50° C.; 50 mmHg) gave 20 g (71.2% yield) of product. m.p. 151° C.

Provenance & Evidence