Phthalimide → 2-{4-[(Oxan-2-yl)oxy]nonyl}-1H-isoindole-1,3(2H)-dione

Participants

Reaction Conditions

Reaction Steps

Sodium hydride (53%) (1.5 g. excess) is washed with benzene three times by decantation, then dimethyl formamide (100 ml.) is added. To this stirred suspension is added a solution of phthalimide (4.3 g., 0.03 mole) in dimethyl formamide (50 ml.) at such a rate as to keep the temperature below 35° C. A clear solution is obtained and to it is added 1-chloro-4-(2-tetrahydropyranyloxy)nonane (7.8 g. 0.03 mole) and the resulting solution is stirred and heated at 95° C. for 20 hours. The reaction is then concentrated to one-half its volume in vacuo, poured into ice water (200 ml.) and extracted with ether (2 × 150 ml.). The ether is washed with 5% sodium hydroxide (2 × 50 ml.), saturated sodium chloride solution (2 × 50 ml.), then dried over sodium sulfate. Evaporation of the ether affords 4.5 g. (45% yield) of N-[4-(2-tetrahydropyranyloxy)nonyl]phthalimide melting 59°- 61° C. After crystallization from cyclohexane the product melts at 62°-63° C. Anal. Calcd. for C22H31NO4 : C, 70.75; H, 8.36; N, 3.75 Found: C, 71.03; H, 8.28; N, 3.81

Provenance & Evidence