A novel approach to the synthesis of regular monocyclopentanoids of the sesquiterpene series
摘要:
A five-step scheme has been developed for the construction of the regular sesquiterpene cyclopentanoid skeleton characteristic of the metabolites of several species of fungi, based on trans-3-isopropenyl-2-phenylsulfonylcyclo-pentan-1-one, readily accessible from methylheptenone.
Synthesis of substituted cyclopentanones from 6-methylhept-5-en-2-one
摘要:
Readily available tert-butyl- and phenyl sulfoxide derivatives of methylheptenone were converted by the Pummerer method to the corresponding five-membered keto sulfides which are probable precursors of iridanes and related terpent cyclopentanoids.
Enantioselective intramolecular cyclopropanation of α-diazo-β-keto sulfones: asymmetric synthesis of bicyclo[4.1.0]heptanes and tricyclo[4.4.0.0]decenes
作者:Masahiro Honma、Masahisa Nakada
DOI:10.1016/j.tetlet.2003.09.215
日期:2003.12
(IMCP) reaction of α-diazo-β-keto sulfones affording bicyclo[4.1.0]heptanes such as 9a–d is found to proceed with high enantioselectivity (93–98% ee). The yield is moderate due to the competing intramolecular C–Hinsertionreaction. As intramolecular C–Hinsertionreaction is not observed in the reaction of the substrates possessing a quaternary carbon at the allylic position, the reactions of 19a
Michael reactions withtrans-3-isopropenyl-2-phenylthiocyclopentan-1-one andtrans-3-isopropenyl-2-phenylsulfonylcyclopentan-1-one
作者:V. V. Veselovsky、B. T. Zhuzbaev、K. M. Turdybekov、S. M. Adekenov、Yu. T. Struchkov、A. M. Moiseenkov
DOI:10.1007/bf00699987
日期:1993.1
acrylate with the title β-ketosulfide and β-ketosulfone was studied. The primary adduct of β-ketosulfone with acrolein readily undergoes intramolecular aldolization to give bicyclo[3.2.1]octane derivatives. The molecularstructure of one of them was elucidated by X-ray analysis.