Novel Approach to the Synthesis of 6-Substituted 5,6-Dihydro-2(2H)-pyranones
作者:Charles Fehr、Jos� Galindo、G�nther Ohloff
DOI:10.1002/hlca.19810640503
日期:1981.7.22
Easily accessible dihydropyrans 9, 10, 12 and 19 are precursors for the synthesis of 6-substituted5,6-dihydro-2 (2H)-pyranones and 6-substituted tetrahydro-2-pyranones. Syntheses of massoia lactone (3), argentilactone (5), tuberolactone (4) and jasmine lactone (2) from acrolein (6), acrolein dimer (7) or glutaraldehyde (16) are described.
Palladium mediated synthesis of conjugated E or Z enones and unsymmetrical divinyl ketones. one-pot preparation of isoegomaketone
作者:N. Jabri、A. Alexakis、J.F. Normant
DOI:10.1016/s0040-4020(01)87356-7
日期:1986.1
The palladium (o) catalyzed coupling of acyl halides or anhydrides with alkenyl copper reagents furnishes α,β ethylenic ketones and α,β-α,β' diethylenic ketones in high yield. The substitution pattern of the alkenyl copper reagent, directly obtained by carbocupration of alkynes, is fully retained. Anhydrides of Z-ethylenic acids also retain their Z stereochemistry. β-halogeno-vinyl ketones react under