A new synthesis of tricyclic sesquiterpene (±)-sterpurene
作者:Goverdhan Mehta、K. Sreenivas
DOI:10.1016/s0040-4039(01)02224-9
日期:2002.1
A new synthesis of tricyclic sesquiterpene, sterpurene 1 is reported. An intermolecular [2+2]-photocycloaddition 14→15 serves as a key step, which is promoted through the stabilisation of the enone excited state through a β-carbomethoxy substituent on the α,β-unsaturated enone moiety. A tricyclo[6.3.0.03,6]undecane based advanced intermediate 19 en route to 1, has been fragmented to the bicyclo[6.3
Electroreduction of gamma and delta-cyano ketones in i-PrOH with Sn cathode gave alpha-hydroxy ketones and their dehydroxylated ketones as the intramolecularly coupled products. Guaiazulene, (-)-valeranone, polyquinanes, dihydrojasmone, methyl dihydrojasmonate, and rosaprostol have been synthesized by utilizing this electroreductive intramolecular coupling of gamma and delta-cyano ketones in one of the key steps. Similarly, electroreduction of a mixture of ketone and nitrile gave the corresponding intermolecularly coupled product. The product obtained by the electroreductive intermolecular coupling of (+)-dihydrocarvone with acetonitrile has been found to be the precursor of an effective chiral ligand for the enantioselective addition of diethylzinc to aldehydes.
Misslitz, Ulf; Primke, Hartmut; Meijere, Armin de, Chemische Berichte, 1989, vol. 122, p. 537 - 544
作者:Misslitz, Ulf、Primke, Hartmut、Meijere, Armin de
DOI:——
日期:——
Synthetic studies towards the novel fomannosane sesquiterpenoid illudosin: framework construction
作者:Goverdhan Mehta、K Sreenivas
DOI:10.1016/s0040-4020(03)00473-3
日期:2003.5
A synthetic approach to the novel fomannosane sesquiterpene natural product illudosin 2 from the diquinane precursor 5, readily available in turn from commercial 1,5-cyclooctadiene, is delineated. The key steps are the stereoselective construction of the cis, anti, cistricyclo[6.2.0.0(2,6)]decane system, strategic C-C bond disengagement through Baeyer-Villiger oxidation and functional group adjustments to deliver the carbocyclic core 18 present in the natural product. (C) 2003 Elsevier Science Ltd. All rights reserved.