4-Bromo-2-nitroaniline → 4-bromo-N-((2-(methylthio)benzo[d]thiazol-6-yl)methyl)-2-nitroaniline

HRID 1848084Notes

Reaction equation

HRID 1848084 reaction equation
[Br:1][C:2]1[CH:8]=[CH:7][C:5]([NH2:6])=[C:4]([N+:9]([O-:11])=[O:10])[CH:3]=1.[BH-](OC(C)=O)(OC(C)=O)OC(C)=O.[Na+].[CH3:26][S:27][C:28]1[S:29][C:30]2[CH:36]=[C:35]([CH:37]=O)[CH:34]=[CH:33][C:31]=2[N:32]=1>C(O)(C(F)(F)F)=O.C(Cl)Cl>[Br:1][C:2]1[CH:8]=[CH:7][C:5]([NH:6][CH2:37][C:35]2[CH:34]=[CH:33][C:31]3[N:32]=[C:28]([S:27][CH3:26])[S:29][C:30]=3[CH:36]=2)=[C:4]([N+:9]([O-:11])=[O:10])[CH:3]=1

Participants

6

Reactant 3

HCID 701324-Bromo-2-nitroanilineHCID 5049666Sodium triacetoxyborohydrideHCID 547753816-Benzothiazolecarboxaldehyde, 2-(methylthio)-

Product 1

HCID 866810644-bromo-N-((2-(methylthio)benzo[d]thiazol-6-yl)methyl)-2-nitroanilineYield 77%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 6422Trifluoroacetic acidSolvent

Procedure

To a stirred mixture of 4-bromo-2-nitroaniline (694 mg, 3.2 mmol) in TFA (5 mL) at −15° C. under argon was added NaBH(OAc)3 (1.1 g, 5.3 mmol) portionwise. The mixture was stirred for 10 min. To the stirred mixture was added dropwise 2-(methylthio)benzo[d]thiazole-6-carbaldehyde (735 mg, 3.5 mmol) from Step 1 of this Example in CH2Cl2 (3 mL). The mixture was stirred for 1 h and then concentrated under reduced pressure. The residue was purified by silica gel flash chromatography eluting with a gradient of 100% hexanes to 100% EtOAc to afford 4-bromo-N-((2-(methylthio)benzo[d]thiazol-6-yl)methyl)-2-nitroaniline (1.0 g, 77%) as a yellow solid. 1H NMR (300 MHz, DMSO-d6) δ 8.84 (t, J=6.0 Hz, 1H), 8.19 (d, J=2.4 Hz, 1H), 7.98 (s, 1H), 7.81 (d, J=8.3 Hz, 1H), 7.56 (dd, J=2.4, 9.3 Hz, 1H), 7.46 (d, J=8.3 Hz, 1H), 6.88 (d, J=9.2 Hz, 1H), 4.75 (d, J=6.0 Hz, 2H), 2.77 (s, 3H). LCMS (ESI) m/z 410 and 412 (M+H)+.

Workup

  1. stirringThe mixture was stirred for 1 h
  2. concentrationconcentrated under reduced pressure
  3. customThe residue was purified by silica gel flash chromatography
  4. washeluting with a gradient of 100% hexanes to 100% EtOAc

Sources & evidence

ORD record
ord-e362d348bf584026ab87c286965a829b
Source dataset
uspto-grants-2015_02
Patent number
US08952058B2

Reaction notes

Loading…