An efficient enantioselective construction of tetrahydronaphthalene-1,4-diones as well as dihydronaphthalene-1,4-diols by a chiral phosphoric acid catalyzed quinone Diels-Alderreaction with dienecarbamates is reported. The nature of the protecting group on the diene is key to the success of achieving high enantioselectivity. The divergent "redox" selectivity is controlled by using an adequate amount
Palladium-Catalyzed Oxidative Synthesis of Highly Functionalized Ortholactones
作者:Kate L. Baddeley、Qun Cao、Mark J. Muldoon、Matthew J. Cook
DOI:10.1002/chem.201500862
日期:2015.5.18
A palladium‐catalyzed oxidative reaction is reported which converts dihydropyrans to their corresponding ortholactone. The products are formed in good to excellent yields with a very high level of chemoselectivity and functional group tolerance. Mechanistic studies confirm that the reaction proceeds by a Wacker‐type mechanism.
A NEW METHOD FOR SYNTHESIS OF α,β-UNSATURATED δ-LACTONES VIA MICHAEL ADDITION USING METHYL (PHENYLSULFINYL)ACETATE
作者:Takashi Yoshida、Shojiro Saito
DOI:10.1246/cl.1982.1587
日期:1982.10.5
Variuos α,β-unsaturated δ-lactones were synthesized viaMichaeladdition of methyl (phenylsulfinyl)acetate to alkyl vinyl ketones in the presence of tributylphosphine. For example, racemic massoia lactone was obtained in 49% overall yield.