[CH3:1][C:2]12[C:15](=[O:16])[CH:6]([CH2:7][C:8]3[CH:13]=[CH:12][C:11]([OH:14])=[CH:10][C:9]=31)[NH:5][CH2:4][CH2:3]2.[CH:17]1([CH2:20]Br)[CH2:19][CH2:18]1.C(=O)(O)[O-].[Na+]>CN(C)C=O>[CH:17]1([CH2:20][N:5]2[CH2:4][CH2:3][C:2]3([CH3:1])[C:15](=[O:16])[CH:6]2[CH2:7][C:8]2[CH:13]=[CH:12][C:11]([OH:14])=[CH:10][C:9]=23)[CH2:19][CH2:18]1A mixture of 1,2,3,4,5,6-hexahydro-6-methyl-8-hydroxy-11-oxo-2,6-methano-3-benzazocine (part A, 0.220 g.), cyclopropylmethyl bromide (0.200 g.) sodium bicarbonate (0.084 g.) and N,N-dimethylformamide (5 ml.) was stirred in a nitrogen atmosphere under reflux (for 2 hr.), then stripped of N,N-dimethylformamide. A solution of the residue in dilute hydrochloric acid (5%) was extracted with ether, neutralized and extracted with ether again. Desiccation and concentration of the latter ether extracts afforded 1,2,3,4,5,6-hexahydro-3-cyclopropylmethyl-6-methyl-8-hydroxy-11-oxo-2,6-methano-3-benzazocine (I: ##STR13## R=CH3, X=HO, Y+Z=O) as a yellow oil, from which with methanesulfonic acid was obtained the methanesulfonate salt as another oil, from which with 1,5-naphthalenedisulfonic acid was obtained the crystalline 1,5-naphthalenedisulfonate tetrahydrate salt (220 mg., m.p. 287°-288° C.).
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