Methanesulfonic Acid → HCID 135568536, compound

HRID 844986Notes

Reaction equation

[BH4-].[Na+].[CH3:3][C:4]1[CH:9]=[CH:8][N:7]2[N:10]=[C:11]([S:13]([NH:16][C:17]3[C:22]([Cl:23])=[CH:21][CH:20]=[CH:19][C:18]=3[Cl:24])(=[O:15])=[O:14])[N:12]=[C:6]2[N:5]=1.CS(O)(=O)=O>CS(C)=O>[CH3:3][CH:4]1[CH2:9][CH2:8][N:7]2[N:10]=[C:11]([S:13]([NH:16][C:17]3[C:22]([Cl:23])=[CH:21][CH:20]=[CH:19][C:18]=3[Cl:24])(=[O:15])=[O:14])[N:12]=[C:6]2[NH:5]1

Participants

Conditions

Temperature: 60 °C

Procedure

Sodium borohydride (0.6 g, 16 mmol) was added to a solution of 3.0 g (8.3 mmol) of 5-methyl-N-(2,6-dichlorophenyl)-1,2,4-triazolo[1,5-a]pyrimidine-2-sulfonamide in 25 ml of dry DMSO. An exothermic reaction occured and 2.0 ml (31 mmol) of methane sulfonic acid in 5 ml of DMSO was added at a rate to maintain the temperature of the reaction mixture at 60° C. After the addition was complete the reaction mixture was stirred for 10 minutes and carefully quenched with 0.5N aqueous NaOH. The clear yellow solution was filtered, and the filtrate was acidified with 3N aqueous HCl. The resulting precipitate was treated with dilute aqueous NaOH and filtered to remove insoluble material. The filtrate was acidified with aqueous HCl to precipitate a solid. The solid was collected by filtration and dried to yield 1.11 g (37%) of the desired product as a solid, m.p. 230°-235° C. IR and 1H NMR spectra were in agreement with the assigned structure.

Workup

customAn exothermic reaction
additionAfter the addition
customcarefully quenched with 0.5N aqueous NaOH
filtrationThe clear yellow solution was filtered
additionThe resulting precipitate was treated with dilute aqueous NaOH
filtrationfiltered
customto remove insoluble material
customto precipitate a solid
filtrationThe solid was collected by filtration
customdried

Sources & evidence

ORD record: ord-5420defd7a5b4c189989f410293398e9
Source dataset: uspto-grants-1988_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04755212

Reaction notes

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