Boron tribromide → HCID 178423497, compound

HRID 2260382Notes

Reaction equation

HRID 2260382 reaction equation
[CH3:1][C:2]1[C:7]2[C:8](=[O:16])[CH:9]=[C:10]([O:14]C)[C:11](=[O:13])[NH:12][C:6]=2[CH:5]=[CH:4][C:3]=1[CH3:17].B(Br)(Br)Br.C([O-])(O)=O.[Na+].[K+].[Br-]>C(Cl)Cl>[CH3:1][C:2]1[C:7]2[C:8](=[O:16])[CH:9]=[C:10]([OH:14])[C:11](=[O:13])[NH:12][C:6]=2[CH:5]=[CH:4][C:3]=1[CH3:17]

Participants

6

Reactant 4

HCID 25134Boron tribromideHCID 253877Potassium BromideHCID 516892Sodium BicarbonateHCID 10728208HCID 10728208, compound

Product 1

HCID 178423497HCID 178423497, compound

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

To a stirred solution of 6,7-dimethyl-3-methoxy-1H-1-benzazepine2,5-dione (300 mg, 1.30 mmol) in dry CH2Cl2 (40 mL, distilled from CaH2) under N2, there was added a solution of BBr3 in CH2Cl2 (6 mL, 1M, Aldrich) in one portion over 1 min at rt. The reaction solution immediately became orange, then an orange precipitate formed during the addition. The reaction was allowed to stir under N2 at rt for 45 min. The reaction was added to saturated NaHCO3 (50 mL) and the resulting mixture was vigorously stirred for 15 min to give a yellow aqueous phase and a near colorless organic phase. The phases were separated and the aqueous phase washed with CH2Cl2 (1×10 mL). The aqueous portion was acidified with concd HCl (pH 2). The resulting precipitate was collected by vacuum filtration, washed to neutrality with H2O (6×2 mL) and dried in vacuo to give a yellow powder. Crystallization from EtOAc (dissolved in 20 mL, hot filtered, coned to 10 mL, allowed to cool to rt) yielded fine green needles (154 mg, 55%, pure by 1H NMR); mp 206°-208° C. (dec.); 1H NMR (DMSO-d6) δ2.16 (s, 3H), 2.23 (s, 3H), 6.30 (s, 1H), 7.09 (d, J=8.1 Hz, 1H), 7.28 (d, J=8.4 Hz, 1H), 10.31 (bs, 1H), 11.08 (s, 1H); IR (KBr) 3260 (m), 3194 (m), 3078 (m), 2989 (m), 1643 (s), 1614 (s), 1581 (m), 1503 (m), 1479 (m), 1449 (m), 1393 (s), 1374 (m), 1347 (m), 1310 (m), 1284 (m), 1259 (m), 1238 (w), 1212 (s), 1145 (m), 1047 (m), 992 (m), 969 (w), 883 (m), 871 (m), 851 (m), 833 (m), 824 (m), 771 (m), 755 (w), 705 (m), 658 (m), 633 (m), 613 (m), 571 (m), 501 (m), 473 (m), 406 (m); Anal. Calcd for C12H11NO3 : C, 66.35, H, 5.10, N, 6.45. Found: C, 66.65; H, 4.81; N, 6.44.

Workup

  1. customThe reaction solution immediately became orange, then an orange precipitate formed during the addition
  2. stirringthe resulting mixture was vigorously stirred for 15 min
  3. customto give a yellow aqueous phase
  4. customThe phases were separated
  5. washthe aqueous phase washed with CH2Cl2 (1×10 mL)
  6. filtrationThe resulting precipitate was collected by vacuum filtration
  7. washwashed
  8. customdried in vacuo
  9. customto give a yellow powder
  10. customCrystallization from EtOAc (dissolved in 20 mL, hot filtered, coned to 10 mL, allowed to cool to rt)
  11. customyielded fine green needles (154 mg, 55%, pure by 1H NMR)

Sources & evidence

ORD record
ord-a329d849d9cc4926be7ffbb6e1d1c91c
Source dataset
uspto-grants-1995_12
Patent number
US05476933

Reaction notes

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