Synthesis of β-Lactam and Anomalous Minor Products in the (i-Pr)2NEt-Promoted Reaction of N-Chloroglycine Methyl Ester Derivative with Dichloroacetyl Chloride

详细

Apart from the expected [2 + 2]-cycloaddition product, the reaction of N-chloro-N-(2-methoxy-2-oxoethyl)-β-alanine methyl ester with dichloroacetyl chloride in the presence of ethyl(diisopropyl)amine gave minor N-(1,2-dichloro-2-oxoethyl)-β-alanine methyl ester and (3E)-1,1,1-trichloro-4-(diisopropylamino)- but-3-en-2-one.