Methyl2,3-dioxoindoline-7-carboxylate

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A suspension of 7-methoxycarbonylisatin (2.4 g) in ether (50 ml) was treated at 31 5° C. with a solution of diazomethane (1.5 g) in ether (140 ml). The mixture was stirred for 3 hours and acetic acid (3 ml) added. The mixture was filtered and the filtrate concentrated under reduced pressure to give a residue that was purified by column chromatograph (silica gel eluting with dichloromethane/methanol) to give 3-hydroxy-8-methoxycarboxy-2-(1H)-quinolinone (350 mg). This in methanol (10 ml) was treated with 2N sodium hydroxide (1.75 ml) at room temperature for 2.5 hours. The mixture was acidified with 2N HCl and the precipitate was collected and dried to give 3-hydroxy-8-carboxy-2(1H)-quinolinone (180 mg); NMR (DMSO-d6 /CF3COOD) 7.12-7.30(m,2H); 7.75(d,1H); 8.01(d,1H). The mixture was filtered the filtrate concentrated under reduced pressure to give a residue that was purified by column chromatograph (silica gel eluting with dichloromethane/methanol)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: By using methyl 7-isatincarboxylate and 2-diisopropylaminoethyl chloride hydrochloride, a method analogous to that described in Reference Example 7 was carried out to obtain methyl 1-(2-diisopropylaminoethyl)-7-isatincarboxylate in an oil (yield: 94.6%).

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A suspension of 7-methoxycarbonylisatin (2.4 g) in ether (50 ml) was treated at 31 5° C. with a solution of diazomethane (1.5 g) in ether (140 ml). The mixture was stirred for 3 hours and acetic acid (3 ml) added. The mixture was filtered and the filtrate concentrated under reduced pressure to give a residue that was purified by column chromatograph (silica gel eluting with dichloromethane/methanol) to give 3-hydroxy-8-methoxycarboxy-2-(1H)-quinolinone (350 mg). This in methanol (10 ml) was treated with 2N sodium hydroxide (1.75 ml) at room temperature for 2.5 hours. The mixture was acidified with 2N HCl and the precipitate was collected and dried to give 3-hydroxy-8-carboxy-2(1H)-quinolinone (180 mg); NMR (DMSO-d6 /CF3COOD) 7.12-7.30(m,2H); 7.75(d,1H); 8.01(d,1H). The mixture was filtered the filtrate concentrated under reduced pressure to give a residue that was purified by column chromatograph (silica gel eluting with dichloromethane/methanol)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: By using methyl 7-isatincarboxylate and 2-diisopropylaminoethyl chloride hydrochloride, a method analogous to that described in Reference Example 7 was carried out to obtain methyl 1-(2-diisopropylaminoethyl)-7-isatincarboxylate in an oil (yield: 94.6%).