2,2-Diethyl-4-pentenoyl chloride → (4R,6R)-6-{2-[(1S,2S,8S,8aR)-1,2,6,7,8,8a-Hexahydro-8-(2,2-diethyl-4-pentenoyloxy)-2-methyl-1-naphthyl]ethyl}tetrahydro-4-t-butyldimethylsilyloxy-2H-pyran-2-one

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A procedure similar to that described in Example 6, above, was followed, but using 1.26 g (3.0 mmol) of (4R,6R)-6-{2-[(1S,2S,8S,8aR)-1,2,6,7,8,8a-hexahydro-8-hydroxy-2-methyl-1-naphthyl]ethyl}tetrahydro-4-t-butyldimethylsilyloxy-2H-pyran-2-one [prepared as described in Japanese Patent Kokai Application No. Sho 59-175450] and 2.09 g (12.2 mmol) of 2,2-diethyl-4-pentenoyl chloride, to provide 1.30 g of the title compound.

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