反应详情

The starting material is manufactured as follows: Reaction of 2-methylene-hexanal with isocyanoacetic acid ethyl ester analogously to Example 1 yields 5-(hexen-2-yl)-2-oxazoline-4-carboxylic acid ethyl ester, which is hydrolysed in a manner analogous to that described in Example 15 to 2-formylamino-3-hydroxy-4-butyl-4-pentenoic acid ethyl ester. Reaction of the 2-formylamino-3-hydroxy-4-butyl-4-pentenoic acid ethyl ester with thionyl bromide and subsequent treatment with trimethyl phosphite analogously to Example 1 yields E-2-formylamino-4-butyl-5-dimethylphosphono-3-pentenoic acid ethyl ester.