2,3,4-Trihydroxybenzaldehyde → Pandacostat

HRID 1020516Notes

Reaction equation

[OH:1][C:2]1[C:9]([OH:10])=[C:8]([OH:11])[CH:7]=[CH:6][C:3]=1[CH:4]=O.[NH:12]([C:14]([C:16]1[CH:21]=[CH:20][C:19](/[CH:22]=[CH:23]/[C:24]([NH:26][OH:27])=[O:25])=[CH:18][CH:17]=1)=[O:15])[NH2:13]>CS(C)=O>[OH:27][NH:26][C:24](=[O:25])/[CH:23]=[CH:22]/[C:19]1[CH:18]=[CH:17][C:16]([C:14]([NH:12]/[N:13]=[CH:4]/[C:3]2[CH:6]=[CH:7][C:8]([OH:11])=[C:9]([OH:10])[C:2]=2[OH:1])=[O:15])=[CH:21][CH:20]=1

Participants

Conditions

Temperature: 70 °C

Procedure

Compound 6a was resynthesized and purified to be re-subjected to the biochemical assay to confirm the results from the initial library screen. To a 4 dram vial charged with 2,3,4-trihydroxybenzaldehyde (25.9 mg, 0.168 mmol) was added 420 μL of a 200 mM solution of hydrazine 5a (0.084 mmol) in DMSO. The solution was heated on a rotating heating block at 70° C. for 16 h. Reaction progress was monitored via LCMS. Following purification by reverse phase preparatory LCMS (44 mL/min, CH3CN/H2O with 1% formic acid, 5 min gradient), 6a (7 mg) was isolated as a yellow powder (98% pure, by analytical LCMS). 1H NMR (300 MHz, DMSO) δ 12.01 (s, 1H), 11.51 (s, 1H), 10.84 (s, 1H), 9.49 (s, 1H), 9.13 (s, 1H), 8.54 (s, 1H), 8.48 (s, 1H), 7.96 (d, J=8.3, 2H), 7.73 (d, J=8.2, 2H), 7.53 (d, J=16.2, 1H), 6.80 (d, J=8.6, 1H), 6.59 (d, J=15.9, 1H), 6.40 (d, J=8.4, 1H); m/z (ES−) 356 ([M-H]).

Workup

customCompound 6a was resynthesized
custompurified
customresults from the initial library screen
temperatureThe solution was heated on
customReaction progress
custompurification by reverse phase preparatory LCMS (44 mL/min, CH3CN/H2O with 1% formic acid, 5 min gradient)

Sources & evidence

ORD record: ord-36c1ba40bb754b12aef0398483c01933
Source dataset: uspto-grants-2014_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08716344B2

Reaction notes

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