| 摘要 |
The present disclosure relates to compounds of Formula I and process of obtaining the same. Said compounds of Formula I is employed in the syntheses of pyrroloquinoline quinone (PQQ), 4,5-dioxo-4,5-dihydro-1H-pyrrolo[2,3-f]quinoline-2,7,9-tricarboxylic acid 2-allyl ester, 5-ethoxy-5-hydroxy-4-oxo-4,5-dihydro-1H-pyrrolo[2,3-f]quinoline-2,7,9-tricarboxylic acid, 5-hydroxy-6-(1,1,4-trioxo-1lambda*6*-1,2,5-thiadiazolidin-2-yl)-1H-indole-2-carboxylic acid and its pharmaceutically acceptable salts. |
