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The IMDA cycloadditions of 10 different ester-tethered 1,3,8-nonatrienes have been examined under controlled microwave heating (MeCN, 180°C, 30min), giving 90–99% yields, and the stereochemical outcome of the exo and endo adducts established together with X-ray crystal structural analysis. A microwave-assisted tandem Wittig–IMDA cycloaddition protocol has been established for a modular synthesis of...
A number of cyclic mono- and di-ketones underwent regioselective olefination with (carbethoxyethylidene)triphenylphospharane under controlled microwave heating. The Wittig reaction of 4-substituted cyclohexanones or 1,2- and 1,4-cyclohexanediones with the ylide at 190°C for 20min in MeCN afforded the exocyclic olefins in >94:6 isomer ratios. On the other hand, the same reactions carried out at...
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