Sequential 1,4- and 1,2-Addition Reactions to α,β-Unsaturated N-Acyliminium Ions: A New Strategy for the Synthesis of Spiro and Bridged Heterocycles
摘要:
Novel bicyclic and tetracyclic spirocycles and tricyclic bridged heterocyclic systems can be readily prepared from sequential 1,4- and 1,2-addition reactions of latent bis-nucleophiles to alpha,beta-unsaturated N-acyliminium ions.
Sequential 1,4- and 1,2-Addition Reactions to α,β-Unsaturated <i>N</i>-Acyliminium Ions: A New Strategy for the Synthesis of Spiro and Bridged Heterocycles
作者:Arife Yazici、Stephen G. Pyne
DOI:10.1021/ol4029513
日期:2013.11.15
Novel bicyclic and tetracyclic spirocycles and tricyclic bridged heterocyclic systems can be readily prepared from sequential 1,4- and 1,2-addition reactions of latent bis-nucleophiles to alpha,beta-unsaturated N-acyliminium ions.
Synthesis of spirocyclic heterocycles from α,β-unsaturated <i>N</i>-acyliminium ions
作者:Thanphat Thaima、Arife Yazici、Chiramet Auranwiwat、Anthony C. Willis、Uta Wille、Thunwadee Limtharakul、Stephen. G. Pyne
DOI:10.1039/d0ob02075c
日期:——
The reactions of α,β-unsaturated N-acyliminium ions, generated in situ from 4(S)-O-substitutedhydroxy-5-hydroxy-5-vinyl-N-alkylpyrrolidin-2-ones, with allylsilanes and indoles leading to the formation of spirocyclic heterocycles, are reported. Six single crystal X-ray structures and extensive 2D NMR experiments confirmed the structures and stereochemistries of these products. In addition, computational