Photo-Fries Rearrangements of Phenyl Phenylacylates in Polyethylene Films. Comparison of Reactivity and Selectivity with 1-Naphthyl Phenylacylates
作者:Weiqiang Gu、Richard G. Weiss
DOI:10.1021/jo001455+
日期:2001.3.1
The fates and kinetics of recombination of singlet radical pairs generated by photolyses of three phenyl phenylacylates have been examined in unstretched and stretched polyethylene films. Comparisons with results from photolyses of analogous 1-naphthyl phenylacylates in the same media lead to the conclusions that (1) phenoxy is less reactive overall than 1-naphthoxy toward a common phenylacyl radical
Rhodium-Phosphoramidite Catalyzed Alkene Hydroacylation: Mechanism and Octaketide Natural Product Synthesis
作者:Max von Delius、Christine M. Le、Vy M. Dong
DOI:10.1021/ja305593y
日期:2012.9.12
heterogeneous base are key for high catalytic activity and linear regioselectivity. This protocol was applied in the atom- and step-economical synthesis of eight biologically active octaketide natural products, including anticancer drug candidate cytosporone B. Mechanistic studies provide insight on parameters affecting decarbonylation, a side reaction that limits the turnover number for catalytic hydroacylation
Direct Syntheses of Benzofuran-2(3<i>H</i>)-ones and Benzofuran-3(2<i>H</i>)-ones from 1-(2-Hydroxyphenyl)alkan-1-ones by CuBr<sub>2</sub>or CuCl<sub>2</sub>
New syntheses of benzofuran-2(3H)-ones and benzofuran-3(211)-ones from l-(2-hydroxyphenyl)alkan-1-ones via oxidative cyclization by CuBr 2 or CuCl 2 are described. A new synthesis of 1H-isochromene-1,4(3H)-diones via similar procedures is also described.
methoxy-substituted isoflavones using LiAlH4 in refluxing THF provides an easy access to a number of α-methyldeoxybenzoins, possible metabolites of phytoestrogens in man. The synthesis of O-demethylangolensin 2b, 6′-hydroxyangolensin 2c, angolensin 2d, 1-(2,4-dihydroxyphenyl)-2-phenylpropan-1-one 2e, 1-(2-hydroxy-4-methoxyphenyl)-2-(4-hydroxyphenyl)propan-1-one 2f, 4′-O-methylangolensin 2g, 1-(2-hydroxy-4-metho