Hydrochloric Acid → 2-Carbethoxy-5-methyl-5,6-dihydropyrrolo[1,2-c]quinazoline

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Reaction Steps

The product of Example XXXVI (14.0 g, 0.0436 m) was dissolved in EtOH (1.5 lit) and the pH was adjusted to 4 with methanolic HCl. A solution of NaBH3CN (18.0 g, 0.272 m) in MeOH (300 ml) was added. The pH was readjusted to 4 at 5 min intervals for 20 min. After this time, the pH remained at 4. The reaction mixture was stirred at ambient temperature for 2 hr. The solvent was removed and the residue slurried in H2O (250 ml) and treated with 1N NaOH until basic. The mixture was extracted with CH2Cl2 (2 × 200 ml). The organic extract was dried over Na2SO4, filtered, and the solvent removed to give a white solid; m.p. 102°-103° C.

Provenance & Evidence