Synthesis of alkylidene cyclopentenones. Enolization of 4-substituted cyclopent-4-ene-1,3-diones
摘要:
The regioselective enolization of 4-substituted cyclopentene-1,3-diones 3a-e is investigated under basic and acidic conditions. Enols 1 and enolethers 6, 7 are formed with the simultaneous endocyclic double bond migration in the side chain. (C) 1998 Elsevier Science Ltd. All rights reserved.
Efficient synthesis of 4-hydroxycyclopentenones: dysprosium(III) triflate catalyzed Piancatelli rearrangement
作者:David Fisher、Leoni I. Palmer、Jonathan E. Cook、Jessica E. Davis、Javier Read de Alaniz
DOI:10.1016/j.tet.2014.03.007
日期:2014.7
4-Hydroxycyclopentenones represent a privileged scaffold in chemical synthesis. A dysprosium(III) trifluoromethanesulfonate catalyzed rearrangement of furylcarbinols to 4-hydroxycyclopentenones via a 4π electrocyclization has been developed. The catalytic Piancatelli rearrangement affords a single trans-diastereomer from both aryl and alkyl substituted furylcarbinols.