Condensation of 3,6-dimethoxy-2-nitrobenzoyl chloride with L-proline methyl ester afforded amide 4, which underwent reductive cyclization with iron(II) sulfate and ammonium hydroxide to yield pyrrolobenzodiazepine 5. Oxidation of 5 with ammonium cerium(IV) nitrate led to the new heterocyclic quinone 6 in 53% overall yield.
Condensation of 3,6-dimethoxy-2-nitrobenzoyl chloride with L-proline methyl ester afforded amide 4, which underwent reductive cyclization with iron(II) sulfate and ammonium hydroxide to yield pyrrolobenzodiazepine 5. Oxidation of 5 with ammonium cerium(IV) nitrate led to the new heterocyclic quinone 6 in 53% overall yield.
作者:Ricardo A. Tapia、Cesar R. Centella、Jaime A. Valderrama
DOI:10.1080/00397919908086212
日期:1999.6
Condensation of 3,6-dimethoxy-2-nitrobenzoyl chloride with L-proline methyl ester afforded amide 4, which underwent reductive cyclization with iron(II) sulfate and ammonium hydroxide to yield pyrrolobenzodiazepine 5. Oxidation of 5 with ammonium cerium(IV) nitrate led to the new heterocyclic quinone 6 in 53% overall yield.