Diels-alder reactions of a cyclopentadienone derivative
Gomes, Maria Goretti, 1971-
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An ester derivative of cyclopentadienone, a very reactive species, was generated from methyl-2-bromo-3-oxocyclopent-1-enecarboxylate (96) which dimerized instantaneously and decarbonylated to generate an indanone (97). Diels-Alder reactions were performed by trapping this fleeting cyclopentadienone derivative with electron rich dienes to generate [4+2] Diels-Alder adducts. The cycloadducts were diastereo- and regioselective. The yields of these reactions were moderate to high. A wide range of dienes were used to show the versatility and scope of these reactions. Using the developed methodology, at attempt was taken to synthesize steroidal drug desogestrel (218).
2007 Freely available dissertations (MU)