[H-].[Na+].[CH3:3][CH:4]1[CH2:9][CH2:8][C:7](=[O:10])[CH2:6][CH2:5]1.[CH3:11][O:12][CH2:13][C:14](OCC)=[O:15].Cl>C1C=CC=CC=1.O>[CH3:11][O:12][CH2:13][C:14]([CH:6]1[CH2:5][CH:4]([CH3:3])[CH2:9][CH2:8][C:7]1=[O:10])=[O:15]
In 50 ml of benzene was suspended 2.5 g of 60% sodium hydride. While cooling the suspension, a mixture of 5.6 g of 4-methylcyclohexanone and 5.4 g of ethyl methoxyacetate was dropwise added thereto. After stirring at room temperature for 2 hours, 20 ml of water was added thereto and the pH was rendered 3 with concentrated hyrochloric acid. The benzene phase was separated and the aqueous phase was extracted with ether. The benzene solution and the ether solution were combined with each other followed by washing with a sodium chloride aqueous solution. After drying, the mixture was concentrated to give 7.4 g of crude 2-methoxyacetyl-4-methylcyclohexanone. The crude product was used at the following step. (2) 4-Cyano-2,3,5,6,7,8-hexahydro-1-methoxymethyl-7-methyl-3-oxoisoquinoline
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