Boron tribromide → HCID 178524888, compound

HRID 2257401Notes

Reaction equation

HRID 2257401 reaction equation
C[O:2][C:3]1[CH:8]=[CH:7][C:6]([CH2:9][CH2:10][CH2:11][C:12]2[N:13]=[C:14]([C:17]([OH:19])=[O:18])[NH:15][CH:16]=2)=[CH:5][CH:4]=1.B(Br)(Br)Br>ClCCl>[OH:2][C:3]1[CH:8]=[CH:7][C:6]([CH2:9][CH2:10][CH2:11][C:12]2[N:13]=[C:14]([C:17]([OH:19])=[O:18])[NH:15][CH:16]=2)=[CH:5][CH:4]=1

Participants

4

Reactant 2

HCID 25134Boron tribromideHCID 178490054HCID 178490054, compound

Product 1

HCID 178524888HCID 178524888, compoundYield 71.1%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Conditions

Temperature
25 °C

Procedure

A solution of the ethyl ester of 13e (1.15 g, 4.0 mmol) in dry dichloromethane (50 ml) was treated with boron tribromide (16 ml, 1.0M solution in CH2Cl2, 16.0 mmol) at 0° C. After 15 min at 0° C., the mixture was warmed to 25° C. and stirred for 16 h. The reaction mixture was cooled in an ice bath and quenched with a dropwise addition of water (20 ml). The resulting mixture was briefly stirred at 25° C. then filtered. The filtrate was carefully neutralised by the addition of solid NaHCO3 to afford 13f (700 mg, 71%) as a white solid: m.p. 186°-187° C. (decomp.) (recrystallised from MeOH); IR (KBr) 3500-2400, 2935, 1640, 1516, 1396, 1232; 1H NMR (d6 -DMSO) δ 9.83 (3H, bs), 7.16 (1H, s), 6.98 (2H, d, J=8.2), 6.66 (2H, d, J=8.2), 2.60-2.40 (4H, m), 1.84 (2H, m). Anal. Calcd for C13H14N2O3 : C, 63.40; H, 5.73; N, 11.38. Found: C, 62.96; H, 5.70; N, 11.27.

Workup

  1. temperatureThe reaction mixture was cooled in an ice bath
  2. customquenched with a dropwise addition of water (20 ml)
  3. stirringThe resulting mixture was briefly stirred at 25° C.
  4. filtrationthen filtered
  5. additionThe filtrate was carefully neutralised by the addition of solid NaHCO3

Sources & evidence

ORD record
ord-d1c6561ca4e04a55a9249e57071c968a
Source dataset
uspto-grants-1997_08
Patent number
US05656627

Reaction notes

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