3-Aminopyridine → 6-(2,6-Dichlorophenyl)-8-methyl-2-(pyridin-3-ylamino)-8H-pyrido[2,3-d]pyrimidin-7-one

HRID 3208

Reaction equation

[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([Cl:8])[C:3]=1[C:9]1[C:20](=[O:21])[N:19]([CH3:22])[C:12]2[N:13]=[C:14](SC)[N:15]=[CH:16][C:11]=2[CH:10]=1.[NH2:23][C:24]1[CH:25]=[N:26][CH:27]=[CH:28][CH:29]=1.Cl.NC1C=NC=CC=1>O>[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([Cl:8])[C:3]=1[C:9]1[C:20](=[O:21])[N:19]([CH3:22])[C:12]2[N:13]=[C:14]([NH:23][C:24]3[CH:25]=[N:26][CH:27]=[CH:28][CH:29]=3)[N:15]=[CH:16][C:11]=2[CH:10]=1

Participants

Conditions

Temperature: 210 °C

Procedure

A mixture of 0.165 g (0.47 mmol) of 6-(2,6-dichlorophenyl)-8-methyl-2-methylsulfanyl-8H-pyrido[2,3-d]pyrimidin-7-one of Example 37, 0.500 g (5.30 mmol) of 3-aminopyridine base, and 0.066 g (0.50 mmol) of 3-aminopyridine hydrochloride was heated with stirring in a 210° C. oil bath for 1 hour. Water (5 mL) was added to the cooled reaction mixture to precipitate a solid. The solid was filtered, washed well with water, and dried; wt 0.147 g. Purification was effected by silica gel chromatography by eluting with chloroform and then ethyl acetate. The ethyl acetate eluent containing the pure product was concentrated to 2 mL volume. The crystals that separated on inducement were filtered and washed with 0.5 mL of ethyl acetate and 1 mL of ether; wt 0.810 g; mp 247°-248° C.

Workup

temperaturewas heated
customto precipitate a solid
filtrationThe solid was filtered
washwashed well with water
customdried
customPurification
washby eluting with chloroform
additionThe ethyl acetate eluent containing the pure product
concentrationwas concentrated to 2 mL volume
customThe crystals that separated on inducement
filtrationwere filtered
washwashed with 0.5 mL of ethyl acetate and 1 mL of ether

Sources & evidence

ORD record: ord-e995bd2a805644e4b3e1fc791d696150
Source dataset: uspto-grants-1998_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05733914

Linked notes

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