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3,5-Dimethoxybenzoic Acid → (2Z)-2-(3-butyl-5-methyl-1,3,4-thiadiazol-2(3H)-ylidene)-1-(3,5-dimethoxyphenyl)ethanone

HRID 448056
Notes
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Reaction equation

HRID 448056 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:9]=[C:10]([O:12][CH3:13])[CH:11]=1)[C:6]([OH:8])=O.CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.CCN(C(C)C)C(C)C.[I-].[CH2:48]([N+:52]1[N:56]=[C:55]([CH3:57])[S:54][C:53]=1[CH3:58])[CH2:49][CH2:50][CH3:51]>>[CH2:48]([N:52]1[N:56]=[C:55]([CH3:57])[S:54]/[C:53]/1=[CH:58]\[C:6]([C:5]1[CH:9]=[C:10]([O:12][CH3:13])[CH:11]=[C:3]([O:2][CH3:1])[CH:4]=1)=[O:8])[CH2:49][CH2:50][CH3:51]
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 4

HCID 143323,5-Dimethoxybenzoic AcidHCID 81531DiisopropylethylamineHCID 9886157Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 691879173-Butyl-2,5-dimethyl-1,3,4-thiadiazol-3-ium iodide

Product 1

HCID 24956428
(2Z)-2-(3-butyl-5-methyl-1,3,4-thiadiazol-2(3H)-ylidene)-1-(3,5-dimethoxyphenyl)ethanone

Procedure

In a 20 mL vial 3,5-dimethoxybenzoic acid (0.9 mL of 0.2 M in DMA, 1.10 equiv) was added followed by the addition of HATU (76 mg in 0.7 mL of DMA, 0.2 mmol, 1.20 equiv.), DIEA (51 mg in 0.7 mL of DMA, 0.4 mmol, 2.40 equiv.), and finally 3-butyl-2,5-dimethyl-1,3,4-thiadiazol-3-ium iodide (49 mg in 0.7 mL of DMA, 0.17 mmol, 1 equiv.). The mixture was shaken overnight at room temperature and then concentrated in vacuo. The resulting residue was taken up in 1:1 DMSO/MeOH and purified by reverse phase HPLC using a method analogous to that described in Example 53 to provide the title compound. 1H NMR (500 MHz, DMSO-d6/D2O) δ ppm 0.87-0.97 (m, 3 H) 1.28-1.37 (m, 2 H) 1.71-1.80 (m, 2 H) 2.46-2.48 (m, 3 H) 3.77-3.83 (m, 6 H) 4.23 (t, 2 H) 6.60-6.68 (m, 2 H) 7.10-7.14 (m, 2 H); MS (ESI) m/z 335 (M+H)+.

Workup

  1. concentrationconcentrated in vacuo
  2. custompurified by reverse phase HPLC

Sources & evidence

ORD record
ord-069a05992a5f4d97b5128ec595a7c6b2
Source dataset
uspto-grants-2013_07
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08481574B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes