Formaldehyde → (3S,8S)-3-(4-Acetoxy-phenyl)-7-((S)-1-phenyl-propyl)-2,3,6,7,8,9-hexahydro-[1,4]dioxino[2,3-g]isoquinoline-8-carboxylic acid methyl ester

HRID 708591Notes

Reaction equation

HRID 708591 reaction equation
[CH3:1][O:2][C:3](=[O:36])[C@@H:4]([NH:26][C@H:27]([C:30]1[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=1)[CH2:28][CH3:29])[CH2:5][C:6]1[CH:25]=[CH:24][C:9]2[O:10][C@@H:11]([C:14]3[CH:19]=[CH:18][C:17]([O:20][C:21](=[O:23])[CH3:22])=[CH:16][CH:15]=3)[CH2:12][O:13][C:8]=2[CH:7]=1.C=O.F[C:40](F)(F)C(O)=O.C([O-])(O)=O.[Na+]>O1CCOCC1>[CH3:1][O:2][C:3]([C@@H:4]1[CH2:5][C:6]2[CH:7]=[C:8]3[O:13][CH2:12][C@H:11]([C:14]4[CH:15]=[CH:16][C:17]([O:20][C:21](=[O:23])[CH3:22])=[CH:18][CH:19]=4)[O:10][C:9]3=[CH:24][C:25]=2[CH2:40][N:26]1[C@H:27]([C:30]1[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=1)[CH2:28][CH3:29])=[O:36]

Participants

6

Reactant 4

HCID 712FormaldehydeHCID 6422Trifluoroacetic acidHCID 516892Sodium BicarbonateHCID 58327474(S)-3-[(S)-2-(4-Acetoxy-phenyl)-2,3-dihydro-benzo[1,4]dioxin-6-yl]-2-((S)-1-phenyl-propylamino)-propionic acid methyl ester

Product 1

HCID 58327394(3S,8S)-3-(4-Acetoxy-phenyl)-7-((S)-1-phenyl-propyl)-2,3,6,7,8,9-hexahydro-[1,4]dioxino[2,3-g]isoquinoline-8-carboxylic acid methyl ester

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Procedure

(S)-3-[(S)-2-(4-Acetoxy-phenyl)-2,3-dihydro-benzo[1,4]dioxin-6-yl]-2-((S)-1-phenyl-propylamino)-propionic acid methyl ester (110 mg) was dissolved in 32 mL dry dioxane and 20 mg paraformaldehyde and 8 mL trifluoroacetic acid were added. The reaction stirred 48 h at rt. NaHCO3 was added until a pH of 7 was achieved, then the mixture was extracted with EtOAc. The organic extract was washed with brine and dried over Na2SO4 and evaporated. The residue was purified by silica gel flash chromatography (9:1 to 8:2 hexanes/EtOAc) to give 120 mg desired product. LCMS (m/z): 503.

Workup

  1. extractionthe mixture was extracted with EtOAc
  2. extractionThe organic extract
  3. washwas washed with brine
  4. dry with materialdried over Na2SO4
  5. customevaporated
  6. customThe residue was purified by silica gel flash chromatography (9:1 to 8:2 hexanes/EtOAc)

Sources & evidence

ORD record
ord-49289eb106a7461a92517d15c00ea2ce
Source dataset
uspto-grants-2015_11
Patent number
US09175003B2

Reaction notes

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