Trifluoroacetic acid → 5,6-Dihydrophenanthridine

HRID 2181827Notes

Reaction equation

HRID 2181827 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[CH:5][C:6]2[C:15]([CH:16]=1)=[C:14]1[C:9]([CH:10]=[CH:11][CH:12]=[CH:13]1)=[N:8][C:7]=2[CH3:17].[BH4-].[Na+].FC(F)(F)C(O)=O.C1C=CC2C3C=CC=CC=3NCC=2C=1.C(N(CC)CC)C.[CH3:48][O:49][C:50]1[CH:55]=[CH:54][C:53]([S:56](Cl)(=[O:58])=[O:57])=[CH:52][C:51]=1[CH3:60]>O1CCCC1.ClCCl>[CH:4]1[CH:3]=[CH:16][C:15]2[C:14]3[CH:13]=[CH:12][CH:11]=[CH:10][C:9]=3[NH:8][CH2:7][C:6]=2[CH:5]=1.[CH3:1][O:2][C:3]1[CH:16]=[C:15]2[C:6]([CH:7]([CH3:17])[N:8]([S:56]([C:53]3[CH:54]=[CH:55][C:50]([O:49][CH3:48])=[C:51]([CH3:60])[CH:52]=3)(=[O:58])=[O:57])[C:9]3[CH:10]=[CH:11][CH:12]=[CH:13][C:14]=32)=[CH:5][CH:4]=1

Participants

10

Reactant 6

HCID 6422Trifluoroacetic acidHCID 8471TriethylamineHCID 2199665,6-DihydrophenanthridineHCID 4311764Sodium borohydrideHCID 159153174-Methoxy-3-methylbenzene-1-sulfonyl chlorideHCID 224823459-Methoxy-6-methylphenanthridine

Product 2

HCID 2199665,6-DihydrophenanthridineHCID 224822639-Methoxy-5-[(4-methoxy-3-methylphenyl)sulfonyl]-6-methyl-5,6-dihydrophenanthridine

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 8028TetrahydrofuranSolvent

Procedure

The intermediate dihydrophenanthridine was prepared from 9-methoxy-6-methylphenanthridine, (Example 36, Step b, 0.7 g, 3.1 mmol), by treatment with sodium borohydride (0.48 g, 12.6 mmol) and trifluoroacetic acid (0.5 mL, 6.3 mmol) in tetrahydrofuran (35 mL). In a separate, second step, the dihydrophenanthridine was treated with triethylamine (1.1 mL, 7.9 mmol) and 4-methoxy-3-methylbenzenesulfonyl chloride (0.87 g, 3.9 mmol, 2 equivalents) in dichloromethane (10 mL) according to the procedure and in the same manner as described in Example 32, Method A, Step d. The crude product was purified by flash column chromatography on silica gel, eluting with a mixture of ethyl acetate-hexane (1:9 to 3:7 gradient), to yield 9-methoxy-5-[(4-methoxy-3-methylphenyl)sulfonyl]-6-methyl-5,6-dihydrophenanthridine as a homogeneous, white solid (0.27 g, 33% from the dihydrophenanthridine);

Workup

  1. customThe crude product was purified by flash column chromatography on silica gel
  2. washeluting with a mixture of ethyl acetate-hexane (1:9 to 3:7 gradient)

Sources & evidence

ORD record
ord-86443e47a7fc4280924e8e962e3ff1b5
Source dataset
uspto-grants-2005_05
Patent number
US06894061B2

Reaction notes

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