Sodium Hydroxide → (1 aS,5aS)-2-(4-Bromo-pyridin-2-yl)-1a,2,5,5a-tetrahydro-1H-2,3-diaza-cyclopropa[a]pentalene-4-carboxylic acid

HRID 1624024Notes

Reaction equation

C([O:3][C:4]([C:6]1[C:7]2[CH2:8][C@@H:9]3[CH2:21][C@@H:10]3[C:11]=2[N:12]([C:14]2[CH:19]=[C:18]([Br:20])[CH:17]=[CH:16][N:15]=2)[N:13]=1)=[O:5])C.[OH-].[Na+]>CO.C1COCC1>[Br:20][C:18]1[CH:17]=[CH:16][N:15]=[C:14]([N:12]2[C:11]3[C@H:10]4[CH2:21][C@H:9]4[CH2:8][C:7]=3[C:6]([C:4]([OH:5])=[O:3])=[N:13]2)[CH:19]=1

Participants

Conditions

Temperature: 23 °C

Procedure

To a solution of (1aS,5aS)-2-(4-bromo-pyridin-2-yl)-1a,2,5,5a-tetrahydro-1H-2,3-diaza-cyclopropa[a]pentalene-4-carboxylic acid ethyl ester (1.00 g, 2.87 mmol) in methanol (5 mL) and THF (5.00 mL) was added a 2.0 M aqueous solution of sodium hydroxide (2.87 mL, 5.74 mmol). The reaction was stirred at 23° C. for 2 h. The organic solvents were removed by distillation. The remaining aqueous solution was diluted with water (20 mL) then acidified to pH ˜2 by addition of 6 M aq. HCl. The resulting precipitate was collected by filtration, rinsed with water, then dried under vacuum to give the title compound (0.87 g) as a white solid. LCMS m/z=320.0 [M+H]+.

Workup

customThe organic solvents were removed by distillation
additionThe remaining aqueous solution was diluted with water (20 mL)
additionthen acidified to pH ˜2 by addition of 6 M aq. HCl
filtrationThe resulting precipitate was collected by filtration
washrinsed with water
customdried under vacuum

Sources & evidence

ORD record: ord-9b9f5b3da35544698961850589bc8cfd
Source dataset: uspto-grants-2014_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08778950B2

Reaction notes

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