β-Diketones in ring formation was written by Basu, Umaprasanna. And the article was included in Journal of the Indian Chemical Society in 1931.HPLC of Formula: 52903-71-6 The following contents are mentioned in the article:
To ascertain the influence of a neg. substituent such as CO2Et, COR, etc., at the methylene C atom of a β-diketonic compound in governing the course of the reaction with substances like CNCH2CONH2 (I) containing a reactive :CH2 group, Me-COCH(CO2Et)COMe (II) was treated with dilute alc. I in the presence of a little pyridine. On acidification there was formed 2-keto-3-cyano-4-methyl-6-hydroxy-1,2-dihydropyridine, CH: C(OH). NH. CO. C(CN): CMe (III), m. 304° (decomposition), hydrolyzed to 4-methyl 2,6-dihydroxypyridine. III was also synthesized from MeCOCH2CO2Et and I. The question arises as to whether the C:C linkage formed by enolization is responsible for the initial condensation or if the CO group remaining as such is the center of reaction. EtOCMe:CHCO2Et, HOCMe:CHCO2Et and H2NCMe:CHCO2Et all condensed with I to form III. Et cyclohexanone-2-carboxylate was condensed with I to produce 3-keto-4-cyano-1-hydroxy-2,3,5,6,7,8-hexahydroisoquinoline (IV), m. 278°, which, when heated with fuming HCl at 180° for 5 hrs., was hydrolyzed to 1,3-dihydroxy-5,6,7,8-tetrahydroisoquinoline, m. 205°. IV was also obtained as the NH4 salt when Et tetrahydroanthranilate (V) was treated with I at 120° for 25 min. although V does not condense with PhCH:CAcBz (VI), facts pointing to the preferential addition of the :CH2 group to the C:C linkage. Heating BzCH:CMeNH2 (VII) with I gave 3-cyano-4-methyl-6-phenyl-2-pyridone, m. 310°, methylated to 3-cyano-1,4-dimethyl-6-phenyl-2-pyridone, m. 265°, which on hydrolysis was converted into 1,4-dimethyl-6-phenyl-2-pyridone-HCl. VII has been found to react with VI, but from a similar experiment with AcCMe: CMeNH2 where there is no methine H atom, no condensation product was isolated, whereas p-MeC6H4COCH: CMeNH2 gave 2-methyl-4,6-diphenyl-3-p-toluyl-5-acetyl-1,4-dihydropyridine, m. 183°, when heated with VI (C. A. 25, 4881). This study involved multiple reactions and reactants, such as 1-Hydroxy-3-oxo-2,3,5,6,7,8-hexahydroisoquinoline-4-carbonitrile (cas: 52903-71-6HPLC of Formula: 52903-71-6).
1-Hydroxy-3-oxo-2,3,5,6,7,8-hexahydroisoquinoline-4-carbonitrile (cas: 52903-71-6) belongs to isoquinoline derivatives. Quinoline and its derivatives are widely used as fungicides, biological agents, antibiotics, alkaloids, dyes, rubber chemicals and flavoring agents. Most traditional methods of generating isoquinoline do so via oxidative aromatization of dihydro- or tetrahydro-isoquinolines, usually offering some environmental or economic advantage.HPLC of Formula: 52903-71-6
Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem