Preparation of cis-4-O-protected-2-cyclopentenol derivatives
申请人:Hoechst Marion Roussel Inc.
公开号:US05728899A1
公开(公告)日:1998-03-17
The present invention relates to a novel process for preparing cis-4-O-protected-substituted-2-cyclopentenol derivatives comprising, a) dissolving a 4-O-protected-2-cyclopentenone in a suitable organic solvent; and b) treating the solution with a suitable Lewis acid and a suitable reducing agent at a temperature of from about -100.degree. C. to about 20.degree. C. The cis-4-O-protected-substituted-2-cyclopentenol derivatives are useful intermediates in the preparation of various cyclopentanyl and cyclopentenyl purine analogs which are useful as immunosuppressants and in the preparation of various prostaglandins.
Straightforward Access to Terminally Disubstituted Electron‐Deficient Alkylidene Cyclopent‐2‐en‐4‐ones through Olefination with α‐Carbonyl and α‐Cyano Secondary Alkyl Sulfones
作者:Lena Trifonov、Ayelet Rothstein、Edward E. Korshin、Olga Viskind、Michal Afri、Gregory Leitus、Krzysztof Palczewski、Arie Gruzman
DOI:10.1002/ejoc.202101258
日期:2021.12.28
A straightforward synthesis of virtually unexplored terminally disubstituted electron-deficient alkylidene cyclopent-2-en-4-ones was elaborated using activated secondary sulfones as alkylidene anion-radical synthons. The presented olefination process is proposed to rely on a base-promoted tandem or sequential Michael addition of C-nucleophiles to 4-acyl- or 4-silyloxycyclopent-2-en-1-ones followed
Asymmetric induction in the addition reactions of chiral sulfinylallyl anions (ambident nucleophiles) with enones (ambident electrophiles). Ring closure of enol thioether ketones
作者:Duy H. Hua、S. Venkataraman、M. Jo Coulter、Gurudas Sinai-Zingde
DOI:10.1021/jo00381a002
日期:1987.3
HUA D. H.; VENKATARAMAN S.; COULTER M. J.; SINAI-ZINGDE G., J. ORG. CHEM., 52,(1987) N 5, 719-728
作者:HUA D. H.、 VENKATARAMAN S.、 COULTER M. J.、 SINAI-ZINGDE G.