3-Methoxycarbonyl-3,4-dihydro-1-oxo-1H-2-benzopyran;dihydro-3,4-isocoumarine-3-carboxylate de methyle;methyl 1-oxoisochroman-3-carboxylate;methyl 1-oxo-3,4-dihydroisochromene-3-carboxylate
Oxidation of 1,3-dicarbonyl compounds using (camphorylsulfonyl)oxaziridines
作者:Franklin A. Davis、Hu Liu、Bang-Chi Chen、Ping Zhou
DOI:10.1016/s0040-4020(98)00500-6
日期:1998.8
The oxidation of 1,3-dicarbonyl compounds with (camphorylsulfonyl)oxaziridines 2 was studied in both cyclic and acyclic systems. Two reaction pathways were identified: enolate α-hydroxylation and a novel Baeyer-Villiger type oxidation. The Baeyer-Villiger oxidation product was observed only for the ketones and arises via rearrangement of an alkoxy epoxide. Synthetically useful ee's (82–95%) were observed
A new approach to the synthesis of 3,4-dihydroisocoumarin derivatives
作者:Mykola D. Obushak、Vasyl S. Matiychuk、Victor V. Turytsya
DOI:10.1016/j.tetlet.2009.08.024
日期:2009.11
A new, simple, one-step synthesis of 3-substituted 3,4-dihydroisocoumarins is developed. The products are obtained by the reaction of o-methoxycarbonyl arenediazonium bromides with unsaturated compounds in the presence of CuBr as a catalyst. (C) 2009 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed β-Arylation of Silyl Ketene Acetals and Application to the Synthesis of Benzo-Fused δ-Lactones
Silyl ketene acetals are shown to be competent nucleophiles in Pd-catalyzed migrative C(sp3)–H arylations. Compared to the parent ester lithium enolates, they possess decreased reactivity but enhanced chemoselectivity. This behavior was exploited through the synthesis of valuable benzo-fused δ-lactones such as 1-isochromanones and dihydrocoumarins.