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Process for preparing 1-(p-acetylphenyl)-2-(2,2-dichloroacetamido)-1,3-propanediol
Process for preparing 1-(p-acetylphenyl)-2-(2,2-dichloroacetamido)-1,3-propanediol
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机译:1-(对乙酰基苯基)-2-(2,2-二氯乙酰胺基)-1,3-丙二醇的制备方法
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摘要
High content (i.e. 90% or more) D,L-threo-b - [p - methyl - 1,3 - dioxolan - 2 - yl) phenyl] serine alkyl or aryl ester hydrochlorides are made by contacting D,L-threo and D,L-erythro - N - [p - (2 - methyl - 1,3 - dioxolan - 2 - yl) benzylidene] - 3 - [p - 2 - methyl - 1,3 - dioxolan - 2 - yl) phenyl] serine alkyl or aryl ester of the formula FORM:1117617/C2/1 wherein R is an alkyl or aryl group, preferably an ethyl group, with one equivalent of water in the presence of hydrogen chloride and recovering the high D,L-threo isomer residue which separates and if desired, treating the mother liquor with either whereby the high D,L-erythro hydrochloride isomer separates and may be recovered.
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