Methanesulfonic Acid → 7-Amino-2-benzhydryloxycarbonyl-3-[2-(pyrid-3-yl-amino)-thiazol-5-yl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene

Participants

Reaction Steps

Methanesulphonic acid (37.7 cc) is added in the course of 5 minutes to a solution of 2-benzhydryloxycarbonyl-7-t-butoxycarbonylamino-3-[2-(pyridin-3-yl-amino)thiazol-5-yl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene (37.22 g) in acetonitrile (372 cc). The mixture is stirred for 5 minutes and the reaction solution is then added to a mixture of a saturated solution of sodium bicarbonate (870 cc), distilled water (1,740 cc) and methylene chloride (580 cc). The mixture is stirred for 10 minutes and the precipitate is filtered off and washed with distilled water (4×100 cc). The product is dried to give 7-amino-2-benzhydryloxycarbonyl-3-[2-(pyridin-3-yl-amino)thiazol-5-yl]-8-oxo-5-thia-1-azabicyclo-[4.2.0]oct-2-ene (27.66 g) in the form of a pale yellow crystalline powder.

Provenance & Evidence