Allylcytisine as a convenient scaffold for the construction of the π,σ-coordination compound {Acyt(H+)}[Cu8{Acyt(H+)}Cl10] with the unusual anionic 1D-coordination polymer
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
作者:T. V. Khakimova、O. A. Pukhlyakova、G. A. Shavaleeva、A. A. Fatykhov、E. V. Vasil'eva、L. V. Spirikhin
DOI:10.1023/a:1013778703658
日期:——
A series of new N-substituted cytisine derivatives was synthesized. The H-1 and (13) C NMR spectra of certain compounds exhibit a doubled set of signals. This is explained by formation of diastereomeric pairs in compounds containing an asymmetric center in the substituents. The signal splitting in -COHC=CHCO2H and HC=O (formyl) derivatives is explained by the existence of Z and E invertomers. Their stereochemical features are discussed. Amide conjugation is confirmed by temperature experiments.