alpha-Acylenamines with terminal double bond CH2=CH(NR2)COMe add dialkyl hydrogen phosphites to form only the Michaelis adducts. Contrary to that hydrophosphorylation of a-formylated enamines proceeds regiospecifically at C=O bond. Subsequent isomerization of the products of 1,2-addition and the cleavage of P-C bond of the intermediate alpha-keto-beta-aminophosphonate yields N, N-disubstituted alpha-aminocarboxylates.
作者:A. Yu. Rulev、S. V. Fedorov、Yu. A. Chuvashev、M. G. Voronkov
DOI:10.1023/a:1026096826472
日期:——
Piperidine reacts with 3-bromo-3-buten-2-one to give a mixture of 3,4-dipiperidinobutan-2-one and 3-piperidino-3-buten-2-one. The latter is also formed by the action of a strong base (Et3N in THF or MeONa in MeOH) on the dipiperidino derivative. Analogous reaction of 2-bromo-3-phenylpropenal with N-methylaniline affords 2-[methyl(phenyl)amino]-3-phenylpropenal which is the first captodative formyl(amino)alkene having a weakly basic tertiary amino group.