Nicotinic Acid → Nicotinoyl chloride

Nicotinoyl chloride was prepared by treating 100 g (0.81 mole) of nicotinic acid with 280 ml of thionyl chloride at reflux for two hours. The excess thionyl chloride was removed in vacuo and the crystalline acid chloride hydrochloride was suspended in 500 ml of dichloromethane. To the stirred mixture was added 66 g (0.30 mole) of 4-p-t-butylphenoxy-1-butanol dissolved in 400 ml of dichloromethane. After forty-eight hours the mixture was washed with one liter of saturated sodium bicarbonate. The dichloromethane solution was dried over magnesium sulfate and evaporated to a syrupy residue. The material was chromatographed on 1 kg of silica gel with elution by dichloromethane-methanol, 96:4, to afford 43.8 g (45%) of the nicotinate ester as an oil. The hydrobromide salt was prepared by treatment of a solution of 43.8 g in 800 ml of ethyl acetate with 30 ml of 4.5N hydrogen bromide in ether. The precipitate was collected, washed with pentane and dried, m.p. 132°-133° C.

1. temperatureat reflux for two hours
2. customThe excess thionyl chloride was removed in vacuo
3. washAfter forty-eight hours the mixture was washed with one liter of saturated sodium bicarbonate
4. dry with materialThe dichloromethane solution was dried over magnesium sulfate
5. customevaporated to a syrupy residue
6. customThe material was chromatographed on 1 kg of silica gel with elution by dichloromethane-methanol, 96:4

ORDレコード

ord-d238f04b14bc48fe99e1c99449a0250c

出典データセット

uspto-grants-1993_09

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US05242936