π-Facial Diastereoselection in Diels−Alder Reactions of (R)-4-[(p-Tolylsulfinyl)methyl]quinols
摘要:
Diels-Alder reactions of a range of (R)-4-hydroxy-4-[(p-tolylsulfinyl)methyl]-2,5-cyclohexadienones with cyclopentadiene and 1,3-pentadiene proceed in a total pi-facial diastereoselective manner from the C-4 OH side. Ab initio calculations at the RHF/6-31G* theory level provide data on transition-state energies for cycloadditions with cyclopentadiene in full agreement with the experimental results.
Studies of Diastereoselectivity in Conjugate Addition of Organoaluminum Reagents to (<i>R</i>)-[(<i>p</i>-Tolylsulfinyl)methyl]quinols and Derivatives
作者:M. Carmen Carreño、Manuel Pérez González、María Ribagorda、K. N. Houk
DOI:10.1021/jo980084i
日期:1998.5.1
(R)-4-Hydroxy-4-[(p-tolylsulfinyl)methyl]-2,5-cyclohexadienones 1-3, and 6 reacted with organoaluminum derivatives from the pro-R conjugated position in a highly pi-facial diastereoselective manner directed by the C-4 OH. A similar facial diastereoselectivity arose from reactions with 3-alkyl-substituted analogues 4 and 5 and 5-alkyl-4-hydroxy-4-[(p-tolylsulfinyl)methyl]-2-cyclohexenones 10a,b. Semiempirical calculations (AM1 model) provide data on transition-state energies for additions in full agreement with the experimental results.
π-Facial Diastereoselection in Diels−Alder Reactions of (<i>R</i>)-4-[(<i>p</i>-Tolylsulfinyl)methyl]quinols
作者:M. Carmen Carreño、Manuel Pérez González、K. N. Houk
DOI:10.1021/jo9712308
日期:1997.12.1
Diels-Alder reactions of a range of (R)-4-hydroxy-4-[(p-tolylsulfinyl)methyl]-2,5-cyclohexadienones with cyclopentadiene and 1,3-pentadiene proceed in a total pi-facial diastereoselective manner from the C-4 OH side. Ab initio calculations at the RHF/6-31G* theory level provide data on transition-state energies for cycloadditions with cyclopentadiene in full agreement with the experimental results.
Diastereoselective Uncatalyzed Conjugate Addition of Organoaluminum Reagents: Efficient Desymmetrization of (<i>R</i>)-[(<i>p</i>-Tolylsulfinyl)methyl]quinols
作者:M. Carmen Carreño、Manuel Pérez González、María Ribagorda、Jean Fischer