Synthesis of 5-methylidenehexahydropyrrolo[l,2-a]imidazoles and 6-methylideneoctahydropyrrolo[l,2-a]pyrimidines by the reaction of 1-alkynyl-1-chlorocyclopropanes with lithium derivatives of 1,2- and 1,3-diaminoalkanes
作者:K. N. Shavrin、V. D. Gvozdev、O. M. Nefedov
DOI:10.1007/s11172-010-0261-6
日期:2010.7
A reaction of 1-alkynyl-1-chlorocyclopropanes with excess of lithiumderivative of 1,2-diaminoethane leads to 5-methylidenehexahydropyrrolo[l,2-a]imidazoles in 35–72% yields, whereas analogous reaction with lithiumderivative of 1,3-diaminopropane gives 6-methyl-ideneoctahydropyrrolo[l,2-a]pyrimidine in up to 50% yield. A mechanism of these unusual multi-step processes includes dehydrochlorination
Synthesis of 6-(arylmethylidene)octahydropyrrolo[1,2-a]pyrimidines and 5-(arylmethylidene)hexahydropyrrolo[1,2-a]imidazoles by the interaction of alk-4-ynals with a,?-diaminoalkanes in DMSO in the presence of KOH
作者:Konstantin N. Shavrin、Valentin D. Gvozdev、Oleg M. Nefedov
DOI:10.1016/j.mencom.2013.05.006
日期:2013.5
Cyclization of alk-4-ynals with alpha,omega-diaminoalkanes in DMSO under the action of KOH affords bicyclic N,N-enaminals - 6-(arylmethylidene)octahydro[1,2-a]pyrimidines and 5-(arylmethylidene)hexahydro[1,2-a]imidazoles.
5-Methylenehexahydropyrrolo[1,2-a]imidazoles and 6-methyleneoctahydropyrrolo[1,2-a]pyrimidines in the reactions of 1-(alk-1-ynyl)-1-chlorocyclopropanes with lithium derivatives of 1,2- and 1,3-diaminoalkanes
作者:Konstantin N. Shavrin、Valentin D. Gvozdev、Oleg M. Nefedov
DOI:10.1016/j.mencom.2008.11.003
日期:2008.11
Unusual reactions of 1-(alk-1-ynyl)-l-chlorocyclopropanes with lithium derivatives of 1,2-diaminoethane, 1,3-diaminopropane and 1-methylamino-3-aminopropane in THF at 20 degrees C give previously unknown 5-methylenehexahydropyrrolo[1,2-a]imidazoles and 6-methyleneoctahydropyrrolo[1,2-a]pyrimidines with up to 60% yields.