58403-93-3Relevant academic research and scientific papers
Abnormal Ito-Saegusa oxidation of TIPS enol ether assisted by a hydroxy group on a side chain
Hiraoka, Shiharu,Harada, Shinji,Nishida, Atsushi
experimental part, p. 3079 - 3082 (2011/06/26)
Although Ito-Saegusa oxidation gives defined α,β-unsaturated ketones from silyl enol ether of ketones controlled by the position of the sp2 carbon of the silyl enol ether, the formation of a regioisomeric product that was oxidized abnormally wa
A cycloaddition approach to tricyclic taxoid skeletons
Lu,Fallis
, p. 2239 - 2252 (2007/10/03)
A cycloaddition approach to the functionalized tricyclo[9.3.1.03,8]pentadecene skeleton contained in Taxol is described. The cyclohexenone 13 was converted as illustrated to the nitrile-aldehyde 24 to which the diene and acetylenic side chains were attached by sequential nucleophilic additions. Removal of the trimethylsilyl protecting group and Dess-Martin oxidation afforded the triene 35. Microwave-assisted thermal cyclization stereoselectively generated the tricyclic ketone 36 whose structure was further established by conversion to the aromatic system 37 upon treatment with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ). An epoxidation sequence was developed to introduce the epimeric C13 alcohol 47 as required for this cycloaddition strategy. Alternatively, an allylic oxidation (CrO3, 3,5-dimethylpyrazole) afforded the C13 ketone 49.
Dihydrofurans from α-diazoketones: Facile rearrangement of donor-acceptor cyclopropanes
Lund, Elizabeth A.,Kennedy, Isaac A.,Fallis, Alex G.
, p. 6841 - 6844 (2007/10/02)
The direct synthesis of dihydrofurans 7, 11, and 23-25 from α-diazoketones 3, 8, and 20-22 is described. The cyclopropane intermediates generated upon treatment of the α-diazoketones with metal catalysts in the presence of ethyl vinyl ether rearranged spo
A NEW AND FACILE PERHYDROAZULENE FORMATION: THE TOTAL SYNTHESIS OF THE CAROTANE (+)-DAUCENE
Audenaert, Frans,Keukeleire, Denis De,Vandewalle, Maurits
, p. 5593 - 5604 (2007/10/02)
Thermolysis of the 2,5-bis(trimethylsiloxy)tricyclo2,5>decan-7-ones 3 leads to perhydroazulenes by a transannular reaction involving an oxygen to oxygen migration of a silyl group in the intermediate cyclodecadienones.This 3-step transf
