A new set of completely green methods utilising air, light, water and spirulina to transform readily accessible furan substrates into a diverse range of synthetically useful polyoxygenated motifs commonly found in natural products is presented herein.
The invention relates to 5′-biphenyl-substituted cyclic ketoenols for therapeutic purposes, to pharmaceutical compositions and to their use in therapy, in particular for the prophylaxis and therapy of tumour disorders.
Singlet oxygen (1O2) proves to be a powerful tool in mediating the one-pot synthesis of a salinomycin-type [6,6,5]-bis-spiroketal unit starting from a suitably substituted furan nucleus.
relies on a new and mild method for butenolide synthesis mediated by thiols. The initial photooxygenation and butenolide synthesis have been merged with subsequent photoredox reactions to achieve rare dual-photocatalyst cascades affording various fused butyrolactones. Ground state Lewis acid activity for methyleneblue has been unveiled and then exploited in the synthesis of substituted cyclopentanones
Stereoselective Synthesis of the Lituarine Tricyclic Spiroacetal
作者:Jeremy Robertson、Paul Meo、Jonathan W. P. Dallimore、Bryan M. Doyle、Christophe Hoarau
DOI:10.1021/ol0483955
日期:2004.10.1
Oxidative cyclizations of 2-(4-hydroxybutyl)furan derivatives provide spirobutenolide acetals directly; on the basis of this methodology, we describe an asymmetric synthesis of a tricyclic spirobutenolide precursor to the C(7-18) fragment common to lituarines A-C.