Inversion of diastereoselectivity under high pressure conditions: Diels–Alder reactions of 12-N-substituted derivatives of (−)-cytisine with N-phenylmaleimide
作者:Inna P. Tsypysheva、Sophia S. Borisevich、Alexander N. Lobov、Alena V. Kovalskaya、Vadim V. Shamukaev、Rustam L. Safiullin、Sergey L. Khursan
DOI:10.1016/j.tetasy.2015.06.005
日期:2015.7
Diels–Alder adducts of 12-N-substituted derivatives of (−)-cytisine with N-phenylmaleimide were synthesized. The conditions of effective diastereodifferentiation were found: the thermal Diels–Alderreaction of 12-N-substituted derivatives of (−)-cytisine with N-phenylmaleimide leads to 3aS, 4R, 12aR, 12bS adducts, while under high pressure, adducts with 3aR, 4S, 12aS, 12bR configurations of new asymmetric
Thionation of quinolizidine alkaloids and their derivatives via Lawesson’s reagent
作者:Alena V. Koval’skaya、Polina R. Petrova、Dmitry O. Tsypyshev、Alexander N. Lobov、Inna P. Tsypysheva
DOI:10.1080/14786419.2020.1868460
日期:2022.7.18
Abstract Direct thionation of quinolizidinealkaloids (-)-cytisine, methylcytisine, thermopsine and some of their carbonyl derivatives was realized. It was established that carrying out of the reaction in the boiling toluene with 0.5 eq. of Lawesson’s reagent (LR) is most effective for synthesis of thio analogues of methyl-, allyl-, benzylcytisine and thermopsine. It was found, that formation of thioamides
Synthesis and specific nootropic activity of (–)-cytisine derivatives with carbamide and thiocarbamide moieties in their structure
作者:I. P. Tsypysheva、A. V. Koval’skaya、N. S. Makara、A. N. Lobov、I. A. Petrenko、E. G. Galkin、T. A. Sapozhnikova、F. S. Zarudii、M. S. Yunusov
DOI:10.1007/s10600-012-0329-7
日期:2012.9
N-(methylcytisinyl)-N′-substituted ureas, N-substituted cytisine-12-carbamides, and cytisine-12-thiocarbamide were prepared by reaction of (–)-cytisine with urea and thiourea and of (–)-cytisine and its 12-N-methyl-3-amino derivative with isocyanates. Their specific nootropic activity was studied in vivo. The therapeutic index was determined for the lead compound. Promising candidates for further pharmacological testing were found.