Synthesis of Racemic and Enantiomerically Enriched a-Oxyfunctionalized Benzocyclanones and Chromanones by Dimethyldioxirane and Dimethyldioxirane/Mn(III) salen System
Enolacetates of benzocyclanones and chromanones were synthesized and treated with dimethyldioxirane and the asymmetric oxidizing system dimethyldioxirane/chiral, non-racemic Mn(III) salen complex/axial ligand. The latter reagent resulted in the corresponding enantiomerically enriched cyclic alpha-hydroxy ketones and their acetates in moderate-to-good yields and modest enantioselectivity under mild and neutral conditions from tetralone and chromanone. On the contrary, flavanone provided poor yields due to the competitive C-H insertion at position 2. The use of R,R-Mn(III)salen catalyst induced an S absolute configuration at the position alpha in the whole series.
Novel photoreactions of chromene derivatives. The photolysis of 4-acetoxy-2-chromene.
作者:Maria J. Climent、Hermenegildo Garcia、Miguel A. Miranda、J. Primoa
DOI:10.1016/s0040-4020(01)90037-7
日期:1987.1
Donnelly, Dervilla M.X.; Finet, Jean-Pierre; Stenson, Paul H., Heterocycles, 1989, vol. 28, # 1, p. 15 - 18
作者:Donnelly, Dervilla M.X.、Finet, Jean-Pierre、Stenson, Paul H.
DOI:——
日期:——
CLIMENT M. J.; GARCIA H.; MIRANDA M. A.; PRIMO J., TETRAHEDRON, 43,(1987) N 5, 999-1002
作者:CLIMENT M. J.、 GARCIA H.、 MIRANDA M. A.、 PRIMO J.
DOI:——
日期:——
Salicylic Acid‐Catalyzed Arylation of Enol Acetates with Anilines
作者:Diego Felipe‐Blanco、Jose C. Gonzalez‐Gomez
DOI:10.1002/adsc.201800427
日期:2018.7.16
α‐Arylketones are both structure moieties commonly found in bioactive compounds and versatile synthetic intermediates for the preparation of drug‐like molecules. An operationally simple and scalable protocol has been developed to prepare α‐arylketonesfrom readily available aromatic amines and enolacetates (or silyl enol ethers). This metal‐free methodology features the use of salicylic acid as