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