Sodium Hydroxide → HCID 68599012, compound

HRID 2385053Notes

Reaction equation

[O:1]=[C:2]1[C:10]2([CH2:14][O:13][C:12]3[CH:15]=[C:16]4[C:20](=[CH:21][C:11]2=3)[CH2:19][CH2:18][O:17]4)[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[N:3]1[CH2:22][C:23]1[O:24][CH:25]=[C:26]([C:28]([O:30]C)=[O:29])[N:27]=1.[OH-].[Na+]>O.CO>[O:1]=[C:2]1[C:10]2([CH2:14][O:13][C:12]3[CH:15]=[C:16]4[C:20](=[CH:21][C:11]2=3)[CH2:19][CH2:18][O:17]4)[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[N:3]1[CH2:22][C:23]1[O:24][CH:25]=[C:26]([C:28]([OH:30])=[O:29])[N:27]=1

Participants

Conditions

Temperature: 60 °C

Procedure

A suspended mixture of methyl 2-[(2′-oxo-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-1′(2′H)-yl)methyl]-1,3-oxazole-4-carboxylate (0.88 g, 2.1 mmol) and sodium hydroxide (4.00 g, 10.0 mmol) in water (50 mL) and methanol (50 mL) was stirred at 60° C. for 2 h. The reaction mixture was concentrated in vacuo to remove most of methanol and acidified with concentrated hydrochloric acid to pH 1-2. The solid residue was filtered off, washed with water (50 mL) and dried in vacuo to afford 2-[(2′-oxo-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-1′(2′H)-yl)methyl]-1,3-oxazole-4-carboxylic acid (0.64 g, 75%) as a colorless solid: 1H NMR (300 MHz, DMSO-d6) δ 8.24 (s, 1H), 7.29-6.95 (m, 4H), 6.55 (s, 1H), 6.37 (s, 1H), 5.08 (ABq, 2H), 4.74 (ABq, 2H), 4.44 (t, J=8.7 Hz, 2H), 3.01-2.80 (m, 2H); MS (ES−) m/z 403.4 (M−1).

Workup

concentrationThe reaction mixture was concentrated in vacuo
customto remove most of methanol
filtrationThe solid residue was filtered off
washwashed with water (50 mL)
customdried in vacuo

Sources & evidence

ORD record: ord-56fc4d07bf4243d5860011bf94cd361c
Source dataset: uspto-grants-2012_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08263606B2

Reaction notes

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