SYNTHESIS OF EXOCYCLIC ENAMIDES VIA STEREOCONTROLLED ALLYLIC ISOMERIZATION AND 1,3-TRANSPOSITION
摘要:
In the presence of pyridinium para-toluenesulfonate (PPTS) an allylic alcohol moiety exocyclic to a lactam ring undergoes allylic isomerisation, or if the solvent is nucleophilic, 1,3-transposition can occur. All the rearrangements occurred with stereocontrol.
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.
Stereocontrolled Formation of Epoxy Peroxide FunctionalityAppended to a Lactam Ring
作者:Charles M. Marson、Afzal Khan、Rod A. Porter
DOI:10.1021/jo001313f
日期:2001.7.1
The action of tert-butylhydroperoxide and tin(IV) chloride upon allylic alcohols containing a lactam ring leads mainly to epoxy alkyl peroxides with high diastereoselection. Both the stereochemistry and the products formed are in marked contrast to the reactions of the analogous carbocyclic allylic alcohols with tert-butyl hydroperoxide-VO(acac)2.
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
SYNTHESIS OF EXOCYCLIC ENAMIDES VIA STEREOCONTROLLED ALLYLIC ISOMERIZATION AND 1,3-TRANSPOSITION
作者:Afzal Khan、Charles M. Marson、Rod A. Porter
DOI:10.1081/scc-100104405
日期:2001.1
In the presence of pyridinium para-toluenesulfonate (PPTS) an allylic alcohol moiety exocyclic to a lactam ring undergoes allylic isomerisation, or if the solvent is nucleophilic, 1,3-transposition can occur. All the rearrangements occurred with stereocontrol.
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.