P(Cl)(Cl)(Cl)=O.[CH2:6]([O:8][C:9]([C:11]1[C:15]([C:16]2[C:21]([NH:22][C:23](OCC3C=CC=CC=3)=O)=[CH:20][CH:19]=[C:18]([O:33][CH3:34])N=2)=[CH:14][NH:13][CH:12]=1)=[O:10])[CH3:7].[C:35](=O)(O)[O-].[Na+].C([O-])([O-])=O.[K+].[K+]>CN(C=O)C>[CH2:6]([O:8][C:9]([C:11]1[C:15]2[C:16]3[CH:35]=[C:18]([O:33][CH3:34])[CH:19]=[CH:20][C:21]=3[N:22]=[CH:23][C:14]=2[NH:13][CH:12]=1)=[O:10])[CH3:7]A 10 mL aliquot DMF is cooled to 5° C. To this is added 2.26 mL (0.024 mol) of phosphorous oxychloride. The mixture is warmed to room temperature, stirred for 15 minutes and cooked to 5° C. To this solution is added dropwise a solution 3.2 g (0.08 mol) of 4-(benzyloxycarbonylamino-6-methoxy-pyridin-2-yl)-1H-pyrrole-3-carboxylic acid ethyl ester dissolved in 15 mL of DMF. The reaction mixture is warmed to room temperature and stirred for 3 hours. The reaction mixture is carefully poured into 100 mL of saturated sodium bicarbonate. The pH is adjusted to 8 with solid K2CO3 and the mixture extracted with ethyl acetate. The organic extracts are dried (Na2SO4) and evaporated. The residue is chromatographed on 150 g of silica gel using ethyl acetate followed by 10/1 chloroform/methanol as the eluant. Appropriate fractions are combined to yield 1.46 grams of 8-methoxy-3H-pyrrolo[2,3-c]quinoline-1-carboxylic acid ethyl ester. 1H NMR (CDCl3) δ 9.10 (s, 1H), 8.35 (d, 1H), 8.10 (s, 1H, 7.2 (s, 1H), 7.05 (d, 1H), 4.4 (q, 2H), 4.10 (s, 3H), 1.40 (t, 3H). Mass spectrum: m/e=260 (p+1). TLC (ethyl acetate) Rf=0.3. Step 8:
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