Ethyl Acetate → HCID 22396830, compound

HRID 1370448Notes

Reaction equation

HRID 1370448 reaction equation
[Cl:1][C:2]1[C:10]2[N:9]([CH2:11][C:12](OCC)=[O:13])[C:8]3[CH2:17][CH2:18][N:19]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:20][CH2:21][C:7]=3[C:6]=2[CH:5]=[C:4]([Cl:29])[CH:3]=1.[Li+].[BH4-].[OH-].[Na+].CCOC(C)=O>C1COCC1.O>[Cl:1][C:2]1[C:10]2[N:9]([CH2:11][CH2:12][OH:13])[C:8]3[CH2:17][CH2:18][N:19]([C:22]([O:24][C:25]([CH3:27])([CH3:26])[CH3:28])=[O:23])[CH2:20][CH2:21][C:7]=3[C:6]=2[CH:5]=[C:4]([Cl:29])[CH:3]=1

Participants

7

Reactant 4

HCID 8857Ethyl AcetateHCID 14798Sodium HydroxideHCID 4148881Lithium borohydride2×HCID 22396583HCID 22396583, compound

Product 1

HCID 22396830HCID 22396830, compoundYield 87.3%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent

Procedure

A solution of tert-butyl 7,9-dichloro-6-(2-ethoxy-2-oxoethyl)-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate (3.00 g, 6.80 mmol) in dry THF (30 mL) was cooled to 0° C. Then, LiBH4 (0.44 g, 20.2 mmol) was added and the reaction was allowed to warm slowly to rt. After 18 h, additional LiBH4 (0.44 g, 20.2 mmol) was added. After an additional 24 h, the reaction was diluted with H2O followed by addition of 10% aqueous NaOH and extraction with EtOAc. The combined organic extracts were washed with brine, dried over Na2SO4, decanted, and concentrated. The crude product was first purified by column chromatography (Biotage 40M, SIM) with heptane/EtOAc (1:1) to give 2.37 g of impure product. Then, crystallization from EtOAc/heptane gave 2.21 g (82%) of ivory crystals: mp 183-184° C.; IR (diffuse reflectance) 1693, 1658, 1468, 1448, 1433, 1406, 1380, 1370, 1347, 1323, 1293, 1226, 1166, 1064, 771 cm1; MS (EI) m/z 398 (M+), 344, 342, 270, 268, 258, 256, 63, 57, 56. Anal. Calcd for C19H24Cl2N2O3: C, 57.15; H, 6.06; N, 7.01; found: C, 57.20; H, 6.11; N, 6.95.

Workup

  1. waitAfter an additional 24 h
  2. washThe combined organic extracts were washed with brine
  3. dry with materialdried over Na2SO4
  4. customdecanted
  5. concentrationconcentrated
  6. customThe crude product was first purified by column chromatography (Biotage 40M, SIM) with heptane/EtOAc (1:1)

Sources & evidence

ORD record
ord-662c852083264f5e98fe197c5d92d55f
Source dataset
uspto-grants-2003_06
Patent number
US06583135B2

Reaction notes

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