(4-Dodecyl-2-thienyl)trimethylstannane → 4,7-Bis-(4-dodecyl-thiophen-2-yl)-5,6-difluoro-benzo[1,2,5]thiadiazole

HRID 335359Notes

Reaction equation

HRID 335359 reaction equation
Br[C:2]1[C:7]2=[N:8][S:9][N:10]=[C:6]2[C:5](Br)=[C:4]([F:12])[C:3]=1[F:13].[CH2:14]([C:26]1[CH:27]=[C:28]([Sn](C)(C)C)[S:29][CH:30]=1)[CH2:15][CH2:16][CH2:17][CH2:18][CH2:19][CH2:20][CH2:21][CH2:22][CH2:23][CH2:24][CH3:25]>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.C1(C)C=CC=CC=1>[CH2:14]([C:26]1[CH:27]=[C:28]([C:2]2[C:7]3=[N:8][S:9][N:10]=[C:6]3[C:5]([C:28]3[S:29][CH:30]=[C:26]([CH2:14][CH2:15][CH2:16][CH2:17][CH2:18][CH2:19][CH2:20][CH2:21][CH2:22][CH2:23][CH2:24][CH3:25])[CH:27]=3)=[C:4]([F:12])[C:3]=2[F:13])[S:29][CH:30]=1)[CH2:15][CH2:16][CH2:17][CH2:18][CH2:19][CH2:20][CH2:21][CH2:22][CH2:23][CH2:24][CH3:25]

Participants

5

Reactant 2

HCID 53473953(4-Dodecyl-2-thienyl)trimethylstannaneHCID 595231044,7-Dibromo-5,6-difluoro-2,1,3-benzothiadiazole

Product 1

HCID 675152814,7-Bis-(4-dodecyl-thiophen-2-yl)-5,6-difluoro-benzo[1,2,5]thiadiazoleYield 89.5%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 1140TolueneSolvent

Conditions

Temperature
105 °C

Procedure

4,7-Dibromo-5,6-difluoro-benzo[1,2,5]thiadiazole (0.33 g, 1 mmol), (4-dodecyl-thiophen-2-yl)-trimethyl-stannane (1.04 g, 2.5 mmol), and Pd(PPh3)4 (20 mg) were combined in a 50-mL Schlenk flask. The system was vacuumed and backfilled with argon for three cycles before 20 mL of anhydrous toluene was added. The mixture was heated at 105° C. for 3 days. After the reaction was cooled down, the solvent was removed by rotary evaporation. The product was further purified by silica gel column with toluene/hexane (v/v, 1/4) as the eluent and recrystallization from a hexane/iso-propoanol mixture. The final product (0.60 g, 89.5% yield) was obtained as red needle crystals after drying in vacuo. 1H NMR (CDCl3, 500 MHz): δ 8.15 (d, 2H, J=1.0 Hz), δ 7.23 (d, 2H, J=1.0 Hz), δ 2.74 (t, 4H, J=7.5 Hz), δ 1.73 (m, 4H), δ 1.29 (m, 18H), δ 0.90 (t, 6H, 7.0 Hz). 13C NMR (CDCl3, 500 MHz): δ 150.8, 148.9, 143.7, 132.3, 131.2, 124.0, 111.7, 31.97, 30.607 30.52, 29.74, 29.72, 29.70, 29.67, 29.53, 29.42, 29.39, 22.75, 14.19.

Workup

  1. additionwas added
  2. temperatureAfter the reaction was cooled down
  3. customthe solvent was removed by rotary evaporation
  4. customThe product was further purified by silica gel column with toluene/hexane (v/v, 1/4) as the eluent and recrystallization from a hexane/iso-propoanol mixture

Sources & evidence

ORD record
ord-c5cf7fe62986482e87bf3f225bbf097d
Source dataset
uspto-grants-2014_11
Patent number
US08883958B2

Reaction notes

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