Chloral Hydrate → 2-(2-Propoxyphenyl)pteridin-4,6(3H,5H)-dione

HRID 728016Notes

Reaction equation

Cl[C:2](Cl)(Cl)[CH:3](O)[OH:4].S(O)(O)(=O)=O.[NH2:13][C:14]1[N:15]=[C:16]([C:22]2[CH:27]=[CH:26][CH:25]=[CH:24][C:23]=2[O:28][CH2:29][CH2:30][CH3:31])[NH:17][C:18](=[O:21])[C:19]=1[NH2:20]>CO>[CH2:29]([O:28][C:23]1[CH:24]=[CH:25][CH:26]=[CH:27][C:22]=1[C:16]1[NH:17][C:18](=[O:21])[C:19]2[NH:20][C:3](=[O:4])[CH:2]=[N:13][C:14]=2[N:15]=1)[CH2:30][CH3:31]

Participants

Conditions

Temperature: 80 °C

Procedure

A solution of chloral hydrate (1.74 g) in 50% aqueous methanol (10 ml) was added over 10 minutes to a stirred solution of 4,5-diamino-2-(2-propoxyphenyl)pyrimidin-6-one sulphate (1.89 g) in 50% aqueous methanol (60 ml) at 80° C. and the reaction mixture was stirred at 80° C. for 1.5 hours. The cooled reaction mixture was filtered to remove an orange brown solid which was discarded. On standing overnight the filtrate afforded a crude solid product (0.96 g) which was collected and washed with dilute aqueous potassium bicarbonate and water. The crude product together with another sample (0.20 g) similarly prepared was eluted from a silica column with chloroform. The combined fractions containing product were evaporated under reduced pressure to afford a solid (0.54 g) which was recrystallised from acetonitrile to afford the title compound, 0.39 g, m.p. 232°-233.5° C.

Workup

customThe cooled reaction mixture
filtrationwas filtered
customto remove an orange brown solid which
waitOn standing overnight

Sources & evidence

ORD record: ord-f7848a0479a2464ea775b02f10e5a06c
Source dataset: uspto-grants-1991_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05047404

Reaction notes

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