C[O:2][C:3]1[CH:4]=[C:5]([C@@:9]23[O:18][C:17]4[CH:19]=[CH:20][CH:21]=[CH:22][C:16]=4[C@@H:10]2[CH2:11][N:12]([CH3:15])[CH2:13][CH2:14]3)[CH:6]=[CH:7][CH:8]=1.C[S-].[Li+].Cl>CN(C)P(N(C)C)(N(C)C)=O.O>[OH:2][C:3]1[CH:4]=[C:5]([C@@:9]23[O:18][C:17]4[CH:19]=[CH:20][CH:21]=[CH:22][C:16]=4[C@@H:10]2[CH2:11][N:12]([CH3:15])[CH2:13][CH2:14]3)[CH:6]=[CH:7][CH:8]=1A mixture of 3.50 g of cis-1,2,3,4,4a,9b-hexahydro-4a-(3-methyoxyphenyl)-2-methyl-benzofuro[3,2-c]pyridine and 3.62 g of lithium thiomethoxide in 30 ml of dry hexamethylphosphoramide was treated at 140° under a drying tube for 41/2 hours. The cooled reaction mixture was diluted with 350 ml of water and the pH adjusted to 7 by slow addition of 2N HCl with stirring. The mixture was extracted with ether (2×300), and the combined extracts were washed with water (3×300 ml), dried over anhydrous Na2SO4, and evaporated in vacuo to provide 3.16 g (94.8%) a solid foam. This material was boiled and triturated with a small amount of ether. After cooling to 0°, the resulting soild was filtered off, washed with cold ether, and dried to afford 2.58 g (77.4%) of crystalline solid, m.p. s 157, 158°-160°.
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