PROCESS FOR PREPARING 4,6-DICHLORO-PYRIMIDINE

摘要

PCT No. PCT/GB96/00013 Sec. 371 Date Jul. 17, 1997 Sec. 102(e) Date Jul. 17, 1997 PCT Filed Jan. 4, 1996 PCT Pub. No. WO96/23776 PCT Pub. Date Aug. 8, 1996A process for preparing 4,6-dichloropyrimidine is described, comprising treating 4,6-dihydroxypyrimidine with phosphorus oxychloride in the presence of a saturated hindered amine, the hydrochloride salt of a saturated hindered amine, or an unsaturated 5-membered nitrogen containing ring or a mixture thereof, and, as a first step, directly extracting the 4,6-dichloropyrimidine so formed.