Stannous chloride dihydrate → HCID 57438891, compound

Reaction equation

[CH3:1][C:2]1[O:3][C:4]2[C:9]([C:10](=[O:12])[CH:11]=1)=[C:8]([N+:13]([O-])=O)[CH:7]=[CH:6][C:5]=2[CH3:16].O.O.[Sn](Cl)Cl.C(=O)(O)[O-].[Na+]>C(OCC)(=O)C>[NH2:13][C:8]1[CH:7]=[CH:6][C:5]([CH3:16])=[C:4]2[C:9]=1[C:10](=[O:12])[CH:11]=[C:2]([CH3:1])[O:3]2

Participants

Procedure

1.78 g (8.12 mmol) of 2,8-dimethyl-5-nitro-4H-chromen-4-one (example 32, stage c) are heated with 9.16 g (40.6 mmol) of tin (II) chloride dihydrate in 70 ml of ethyl acetate at 70° C. overnight. After cooling to room temperature, the reaction mixture is adjusted to pH 9-10 with saturated sodium bicarbonate solution. After filtration through kieselguhr, the organic phase is separated off, and the aqueous phase is extracted several times with ethyl acetate. The combined organic phases are washed with saturated sodium chloride solution. After drying over sodium sulfate, the solvent is removed in vacuo. 1.5 g (99% of theory) of the title compound are obtained.