Dimethylformamide → ethyl 7-{N-[4-(2-tetrahydropyranyloxy)nonyl]methanesulfonamido}-2-methylheptanoate

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Reaction Steps

A stirred suspension of sodium hydride (57%) (5.0 g., excess) in a solvent mixture of benzene (75 ml.) and dimethylformamide (75 ml.) is treated, over 30 minutes, with N-[4-(2-tetrahydropyranyloxy)nonyl]methanesulfonamide (Example N, Step 4) (32.1 g., 0.1 mole) dissolved in benzene (20 ml.). Stirring is continued for one hour. Then ethyl 7-bromo-2-methylheptanoate (Example L, Step 4) (25.3 g., 0.1 mole) is added dropwise, and the reaction is heated on the steam bath for 6 hours. The cooled reaction mixture is poured into water (400 ml.) and extracted with ethyl acetate (2× 200 ml.). The organic fractions are combined, washed with brine, then dried over sodium sulfate. The solvents are removed in vacuo to give ethyl 7-{N-[4-(2-tetrahydropyranyloxy)nonyl]methanesulfonamido}-2-methylheptanoate as a pale yellow liquid.

Provenance & Evidence