Heterocyclic betaines. 14. (E)-1-Alkyl-[2-(imidazol-2-ylidene)ethylidene]dihydropyridines with a betaine character. An improved protocol for a Knoevenagel-type condensation for synthesis of (E)-1-alkyl-[2-(1H-imidazol-2-yl)vinyl]pyridinium salts
作者:Ermitas Alcalde、Tomas Roca
DOI:10.1021/jo00044a015
日期:1992.8
A novel class of aza analogues of (E)-stilbene, the (E)-1-alkyl-[2-(imidazol-2-ylidene)ethylidene]dihydropyridines 4A <-> 4B, 5A <-> 5B, have been studied. They were synthesized by a convenient two-steps procedure. In each of the steps, the necessary basic reaction medium has been generated by a strong basic ion-exchange resin (OH- form). Thus, a modified protocol of the Knoevenagel condensation has been applied to preparation of the title (imidazolylvinyl)pyridinium salts, deprotonation of which yields several examples of compounds 4 and 5. The betaine character of 4 and 5 is well reflected by their physicochemical properties and reactivity toward electrophiles (Mel).
MANOHARAN, T. S.;BROWN, R. S., J. ORG. CHEM., 53,(1988) N 5, 1107-1110
作者:MANOHARAN, T. S.、BROWN, R. S.
DOI:——
日期:——
1-(1-Ethoxyethyl): an effective protecting group for imidazole nitrogen