Preparation of 3-trifluoromethyl-2-cycloalkenones by the oxidative rearrangement of trifluoromethylated tertiary allylic alcohols with pyridinium chlorochromate
作者:G.K.Surya Prakash、Emily C. Tongco、Thomas Mathew、Yashwant D. Vankar、George A. Olah
DOI:10.1016/s0022-1139(99)00159-1
日期:2000.2
Trifluoromethylated tertiary allylicalcohols, obtained from trifluoromethylation of several conjugated enones, undergo oxidativerearrangements to 3-trifluoromethyl-2-cycloalkenones with pyridinium chlorochromate in the presence of a small amount of concentrated H2SO4.
由几种共轭烯酮的三氟甲基化制得的三氟甲基化叔烯丙醇,在少量浓H 2 SO 4的存在下,与氯铬酸吡啶鎓发生氧化重排反应,生成3-三氟甲基-2-环烯酮。
Direct hydroperoxygenation of conjugated olefins catalyzed by cobalt(II) porphyrin
A novel and direct synthesis of hydroperoxy compounds from various types of conjugated olefins was established via cobalt(II) porphyrin-catalyzed hydroperoxygenation. The reaction of α,β,γ,δ-unsaturated carbonyl compounds, acrylic esters, α-substituted acrylic esters and styrene derivatives with molecular oxygen and triethylsilane in the presence of a catalytic amount of cobalt(II) porphyrin proceeded
Synthesis of γ-hydroperoxy-α,β-unsaturated carbonyl compounds from α,β,γ,δ-unsaturated carbonyl compounds by cobalt(<scp>II</scp>) porphyrin-catalysed hydroperoxygenation
γ-Hydroperoxy-α,β-unsaturated carbonyl compounds are prepared in good yields by the regioselective hydroperoxygenation of α,β,γ,δ-unsaturated carbonyl compounds with molecular oxygen and triethylsilane in the presence of cobalt(II) porphyrin as a catalyst.
α,β,γ,δ-Unsaturated carbonyl compounds were converted regioselectively into γ-hydroxy-α,β-unsaturated carbonyl compounds by reduction-oxygenation with molecular oxygen and triethylsilane in the presence of cobalt(II) porphyrin as a catalyst followed by treatment with trimethyl phosphite. (±)-6-Hydroxyshogaol and related furanoids isolated from ginger were synthesized via this method.