2,2-Dimethoxypropane → HCID 86733713, Verbindung

Reaktionsgleichung

[CH3:1][O:2][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][CH:12]=1)[CH2:9][CH:8]([C@H:13]1[C@:17]([CH3:22])([CH2:18][C:19]([OH:21])=[O:20])[C@@H:16]([OH:23])[CH2:15][CH2:14]1)[CH2:7][CH2:6]2.[CH3:24]OC(OC)(C)C.O.C1(C)C=CC(S(O)(=O)=O)=CC=1>CO>[CH3:1][O:2][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][CH:12]=1)[CH2:9][CH:8]([C@H:13]1[C@:17]([CH3:22])([CH2:18][C:19]([O:21][CH3:24])=[O:20])[C@@H:16]([OH:23])[CH2:15][CH2:14]1)[CH2:7][CH2:6]2

Komponenten

Versuchsvorschrift

A solution of 2.19 g of (1S,2S,5S)-5-(1,2,3,4-tetrahydro-6-methoxy-2-naphthyl)-2-hydroxy-1-methylcyclo-pentaneacetic acid and 5 ml of 2,2-dimethoxypropane in 40 ml of methanol containing 0.05 g of p-toluenesulfonic acid monohydrate is refluxed for 18 hours. The resultant solution is partitioned between aqueous 5% sodium bicarbonate and ether. The ether phase is separated, dried over magnesium sulfate, and stripped of solvent by vacuum distillation. The residue is crystallized from a mixture of acetone and hexane to give methyl (1S,2S,5S)-5-(1,2,3,4-tetrahydro-6-methoxy-2-naphthyl)-2-hydroxy-1-methylcyclopentaneacetate melting at approximately 86°-87°.