作者:V. A. Ozeryanskii、E. A. Filatova、V. I. Sorokin、A. F. Pozharskii
DOI:10.1023/a:1011359109826
日期:——
Efficient procedures were developed for the two-step synthesis of 1,2,2,3-tetramethyl-2,3-dihydroperimidines and for the one-step synthesis of 1,3-dimethyl-2,3-dihydroperimidines starting from 1,8-diaminonaphthalenes. New possibilities of the use of 2,3-dihydroperimidinium salts in the synthesis of 1,8-bis(dialkylamino) naphthalenes ("proton sponges") containing the IV-isopropyl group along with the A-methyl groups were demonstrated. The 1,1,2,2,3-pentamethyl-2,3-dihydroperimidinium cation exists in the acyclic iminium form responsible for its high reactivity.