[OH:1][C:2]1[C:7]2=[CH:8][C:9]3[C:14]([N:6]2[CH2:5][CH2:4][C:3]=1[C:15]([O:17][CH2:18][CH3:19])=[O:16])=[CH:13][CH:12]=[CH:11][CH:10]=3.[C:20]([O:24][CH3:25])(=[O:23])[CH:21]=[CH2:22].CN(C)C(N(C)C)=N.Cl>C(#N)C.O>[CH2:18]([O:17][C:15]([C:3]1([CH2:22][CH2:21][C:20]([O:24][CH3:25])=[O:23])[CH2:4][CH2:5][N:6]2[C:14]3[C:9]([CH:8]=[C:7]2[C:2]1=[O:1])=[CH:10][CH:11]=[CH:12][CH:13]=3)=[O:16])[CH3:19]
A mixture of 5 g of ethyl 6,7-dihydro-9-hydroxypyrido[1,2-a]indole-8-carboxylate. 1.85 g of methyl acrylate and 250 mg of 1,1,3,3-tetramethylguanidine was dissolved in 250 ml of acetonitrile and the solution was stirred overnight, poured into 500 ml of water containing 20 ml of 2M hydrochloric acid and extracted with diethyl ether. The ethereal extracts were washed with water, dried and concentrated. There were obtained 6.33 g of methyl 8-(ethoxycarbonyl)-6,7,8,9-tetrahydro-9-oxopyrido[1,2-a]indole-8-propionate.
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