によって Tony Zoltika 17年前.
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- synthesis of Grignard-reagent
- treatment with Grignard-reagent of aldehyde
- cyclization of product to alkyl-laktone
- reduction of aldehyde with NaBH4
- cyclization of second OH to lactone
- purification
- cyclization of (alkyl) carboxylic acid to alkylated cyclic ketone
ester hydrolysis