反应详情

A solution of sulfuryl chloride (2.84 g) in methylene chloride (5 ml) was dropwise added to a solution of ethyl 4-(2-pyridyl)-2,4-dioxobutyrate (4.42 g) in methylene chloride (60 ml) at 8° C. to 25° C. After the mixture was stirred for 30 minutes at ambient temperature, diethyl ether (60 ml) was added thereto. The precipitated crystals were collected by filtration, washed with diethyl ether and dried to give ethyl 3-chloro-4-(2-pyridyl)-2,4-dioxo-butyrate hydrochloride (5.6 g).

1. filtrationThe precipitated crystals were collected by filtration
2. washwashed with diethyl ether
3. customdried