Selective alkylation of ethyl 3-oxoglutarate. II. Synthesis of a prostaglandin intermediate and synthesis of dihydrojasmone and methyl dihydrojasmonate.

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The synthesis of 2-(6-methoxycarbonylhexyl)cyclopent-2-ene-I-one (5), a valuable inter-mediate in the synthesis of prostaglandins, is described starting from ethyl 3-oxoglutarate (1). The same reaction sequence also produces dihydrojasmone (12) and methyl dihydrojas-monate (13).

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