[最新] α β-γ δ-unsaturated-γ-lactone 658800

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The pyranoid α,βunsaturated δlactone 29 proved to be the most active compound in this series towards the plant pathogenic fungi Colletotrichum coffeanum (coffee Ringclosing olefin metathesis reactions (RCM) using Grubbs II or Hoveyda's catalysts have been applied to a series of NalkenylNbenzylαfluoroacrylamides αFluoroα,βunsaturated γ or δlactams incorporating a fluorinated double bond were obtained in moderate to good yields, depending on the nature of substituents on the benzyl ringThe corresponding

α β-γ δ-unsaturated-γ-lactone

α β-γ δ-unsaturated-γ-lactone-Next article in issue;Two novel and convenient routes to obtain enantiomerically enriched transβarylδhydroxyγlactones 5ad with potential antifeedant and anticancer activity were developed In the first method starting from corresponding enantiomers of γ,δunsaturated esters 4ad derived from enzymatically resolved allyl alcohols 1ad, both enantiomers of hydroxylactones 5ad were

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A B(C 6 F 5) 3catalyzed chemoselective hydrosilylation of α,β and α,β,γ,δunsaturated ketones provides the corresponding nonsymmetric ketones in mild reaction conditions The reaction tolerates a broad range of reducible functional groups such asField of δalkylatedγsilylatedα,βunsaturated δlactones 1 These compounds are easily synthesized in enantiomerically pure forms and in a highly diastereoselective manner by a tandem rearrrangement / alkylationlactonization sequence starting from α,βepoxyγ,δvinylsilanes 22 (Scheme 1) TBDMS O CO2Me 1) Pd(0) 2) RM O O R TBDMS 2 7090% 1 Scheme 1 Issue in Here we report an efficient asymmetric 42 cycloaddition of β,γunsaturated αketoesters with cyclobutenones The corresponding products were obtained in good yields (up to 92%) with excellent enantioselectivities (up to 98% ee) and diastereoselectivities (up to >19/1 dr) Moreover, based on the control experiments and previous reports, a possible catalytic cycle was

During an ongoing exploration of potential antiinflammatory agents from medicinal plants, eight new arylalkenyl α,βunsaturated δlactones, cryptoconcatones AH (18), and two unusual arylalkenyl α,βunsaturated γlactones, cryptoconcatones I and J (9 and 10), were identified from the leaves and twigs of Cryptocarya concinna The structures of these The syntheses of the chiral α,βunsaturated lactones ()5, (−)6, ()8, ()9, and ()10 have been efficiently achieved from readily available starting materialsThe lactone ()5 has been synthesized in 7 steps from (R,R)dimethyl tartrate (38–43% overall yield)The use of ()5 in formal syntheses of natural ()asperlin 4 and advanced intermediates for ()olguine 2 are alsoDecarboxylation of α,βunsaturated aromatic lactones synthesis of Eorthohydroxystilbenes from 3arylcoumarins or isoaurones† Xihua Huang , ‡ a Jie Liu , ‡ a Jianfei Sheng , a Xianheng Song , a Zhibo Du , b Mingkang Li , ab Xuejing Zhang a and Yong Zou * abc

α β-γ δ-unsaturated-γ-lactoneのギャラリー

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γOxoα,βunsaturated δlactones and lactams, which are easily accessible from their corresponding 2furylcarbinols, were used as substrates for the 1,4reductive addition of hydrazoic acid The outcome of the reaction is the formation, in high yields, of the corresponding αaminoγoxoα,βunsaturated δlactones and lactams, compounds of great biological and syntheticThe crude acids were treated with 2,4,6trichlorobenzoyl chloride in pyridine to afford γlactone or δlactone, The α,βunsaturated lactones are found as structural subunits in a wide variety of natural products possessing diverse biological activities as shown in Chart 1 Furthermore, simple lactones have been used as intermediates for the synthesis of biologically active compounds

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