Characterization of α-halo-imine intermediates derived from halogenation of dehydroamino acid derivatives
摘要:
An efficient one-pot Erlenmeyer-Plochl reaction affords high yields of optically active aliphatic dehydroamino acid derivatives. Subsequent halogenation with NBS or NIS yields the alpha-halo-imine derivatives which undergo kinetically controlled tautomerization with Et3N, resulting in increased E selectivity. Isomerization of these derivatives in the presence of strong base (DABCO) results in exclusive formation of the more stable Z vinyl bromides. High yields of the beta-halo-dehydroamino acids are obtained in all cases.
Heyns,K.; Gruetzmacher,H.-F., Zeitschrift fur Naturforschung. Teil B. Anorganische Chemie, organische Chemie, Biochemie, Biophysik, Biologie, 1961, vol. 16, p. 293 - 298
作者:Heyns,K.、Gruetzmacher,H.-F.
DOI:——
日期:——
Characterization of α-halo-imine intermediates derived from halogenation of dehydroamino acid derivatives
作者:Andrew P. Combs、Robert W. Armstrong
DOI:10.1016/s0040-4039(00)79004-6
日期:1992.10
An efficient one-pot Erlenmeyer-Plochl reaction affords high yields of optically active aliphatic dehydroamino acid derivatives. Subsequent halogenation with NBS or NIS yields the alpha-halo-imine derivatives which undergo kinetically controlled tautomerization with Et3N, resulting in increased E selectivity. Isomerization of these derivatives in the presence of strong base (DABCO) results in exclusive formation of the more stable Z vinyl bromides. High yields of the beta-halo-dehydroamino acids are obtained in all cases.