Hydrochloric Acid → HCID 58970492, compound

HRID 606373Notes

Reaction equation

HRID 606373 reaction equation
[Li]CCCC.C(NC(C)C)(C)C.[Cl:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][C:15]=1[CH:20]([O:22][C:23]1[CH:27]=[CH:26][S:25][C:24]=1[C:28]([O:30][CH3:31])=[O:29])[CH3:21].C(O[B:36]1[O:40][C:39]([CH3:42])([CH3:41])[C:38]([CH3:44])([CH3:43])[O:37]1)(C)C.Cl>C1COCC1>[Cl:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][C:15]=1[CH:20]([O:22][C:23]1[CH:27]=[C:26]([B:36]2[O:40][C:39]([CH3:42])([CH3:41])[C:38]([CH3:44])([CH3:43])[O:37]2)[S:25][C:24]=1[C:28]([O:30][CH3:31])=[O:29])[CH3:21]

Participants

7

Reactant 5

HCID 313Hydrochloric AcidHCID 7912DiisopropylamineHCID 50177412-Isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolaneHCID 58525266Methyl 3-(1-(2-chlorophenyl)ethoxy)thiophene-2-carboxylateHCID 178418339Butyllithium

Product 1

HCID 58970492HCID 58970492, compoundYield 51.6%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent3×

Conditions

Temperature
0 °C

Procedure

2.5 M n-BuLi in hexanes (2.3 mL, 5.77 mmol, 1.5 Eq.) was added dropwise to a stirred solution of diisopropylamine (815 μL, 5.77 mmol, 1.5 Eq.) in anhydrous THF (20 mL) at −78° C. under nitrogen. The reaction was stirred at this temperature for 15 minutes then warmed to 0° C. for 30 minutes. The reaction was cooled to −78° C. and a solution of methyl 3-(1-(2-chlorophenyl)ethoxy)thiophene-2-carboxylate (1.14 g, 3.84 mmol, 1.0 Eq.) in anhydrous THF (10 mL) was added dropwise. After stirring at this temperature for 10 minutes, a solution of 2-isopropoxy-4,4,5,5-tetramethyl[1,3,2]-dioxaborolane (1.78 mL, 5.77 mmol, 1.0 Eq.) in anhydrous THF (10 mL) was added dropwise and stirred at −78° C. for 15 minutes then warmed to ambient temperature for 45 minutes. 1M HCl (30 mL) was added and the mixture extracted with EtOAc (3×40 mL). The combined organic extracts were washed with brine (30 mL), dried (MgSO4) and the solvent removed in vacuo. The residue was recrystalised from cyclohexane to give the sub-title compound as a white solid (837 mg, 1.98 mmol, 51%); 1H NMR (400 MHz, CDCl3) δ 1.38 (12H, s), 1.67 (3H, d), 3.90 (3H, s), 5.80 (1H, quint), 7.18 (1H, s), 7.21-7.7.34 (2H, m), 7.38 (1H, dd), 7.77 (1H, dd).

Workup

  1. temperatureThe reaction was cooled to −78° C.
  2. stirringAfter stirring at this temperature for 10 minutes
  3. stirringstirred at −78° C. for 15 minutes
  4. temperaturethen warmed to ambient temperature for 45 minutes
  5. extractionthe mixture extracted with EtOAc (3×40 mL)
  6. washThe combined organic extracts were washed with brine (30 mL)
  7. dry with materialdried (MgSO4)
  8. customthe solvent removed in vacuo
  9. customThe residue was recrystalised from cyclohexane

Sources & evidence

ORD record
ord-b9bc73b52faa4d7a8cccfd98974cc584
Source dataset
uspto-grants-2011_03
Patent number
US07915305B2

Reaction notes

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