85960-58-3Relevant academic research and scientific papers
Tandem Wessely oxidation and intramolecular Diels-Alder reactions. III. Synthesis of isotwistanes
Yates, Peter,Macas, Tadas S.
, p. 1 - 10 (2007/10/02)
Wessely oxidation of o-(3-alkenyl) phenols (5) with lead tetraacetate gives 6-acetoxy-6-(3-alkenyl)-2,4-cyclohexadien-1-ones (6), which undergo intramolecular Diels-Alder reactions to give isotwistene (hexahydro-1,5-methanoindene) derivatives (7).These, on hydrolysis followed by oxidation with periodic acid, give hexahydro-1-oxo-1H-indene-5-carboxylic acids (41, 46).Compounds 5 were prepared either by Grignard coupling of o-methoxybenzyl chloride with allyl halides followed by de-O-methylation with sodium thioethoxide or via reduction of dihydrocoumarins (18-20) to 2-chromanols (21-23) with diisobutylaluminum hydride, followed by Wittig reaction of these with ethyl (triphenylphosphoranylidene)acetate.
A GENERAL SYNTHESIS OF ISOTWIST-8-EN-2-ONES FROM o-(3-BUTENYL)PHENOLS
Macas, Tadas S.,Yates, Peter
, p. 147 - 150 (2007/10/02)
Wessely oxidation of o-(3-butenyl)phenols with lead tetraacetate gives 2,4-cyclohexadienone derivatives that on heating undergo intramolecular Diels-Alder reactions to give 3-acetoxyisotwist-8-en-2-ones.
