2-Tert-butoxycarbonylamino-3-{(s)-2-[3-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro-benzo[1,4]dioxin-6-yl}-acrylic acid methyl ester → (S)-2-tert-Butoxycarbonylamino-3-{(S)-2-[3-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro-benzo[1,4]dioxin-6-yl}-propionic acid methyl ester

HRID 391823Notes

Reaction equation

HRID 391823 reaction equation
[CH3:1][O:2][C:3](=[O:40])[C:4]([NH:32][C:33]([O:35][C:36]([CH3:39])([CH3:38])[CH3:37])=[O:34])=[CH:5][C:6]1[CH:31]=[CH:30][C:9]2[O:10][C@@H:11]([C:14]3[CH:19]=[CH:18][CH:17]=[C:16]([O:20][CH2:21][C:22]4[CH:27]=[CH:26][C:25]([Cl:28])=[C:24]([Cl:29])[CH:23]=4)[CH:15]=3)[CH2:12][O:13][C:8]=2[CH:7]=1>C(Cl)Cl.CCOC(C)=O>[CH3:1][O:2][C:3](=[O:40])[C@@H:4]([NH:32][C:33]([O:35][C:36]([CH3:38])([CH3:37])[CH3:39])=[O:34])[CH2:5][C:6]1[CH:31]=[CH:30][C:9]2[O:10][C@@H:11]([C:14]3[CH:19]=[CH:18][CH:17]=[C:16]([O:20][CH2:21][C:22]4[CH:27]=[CH:26][C:25]([Cl:28])=[C:24]([Cl:29])[CH:23]=4)[CH:15]=3)[CH2:12][O:13][C:8]=2[CH:7]=1

Participants

4

Reactant 1

HCID 667194902-Tert-butoxycarbonylamino-3-{(s)-2-[3-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro-benzo[1,4]dioxin-6-yl}-acrylic acid methyl ester

Product 1

HCID 58327360(S)-2-tert-Butoxycarbonylamino-3-{(S)-2-[3-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro-benzo[1,4]dioxin-6-yl}-propionic acid methyl esterYield 94.1%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 8857Ethyl AcetateSolvent

Procedure

(+)-1,2-bis((2S,5S)-2,5-Diethylphospholano)benzene (cyclooctadiene) rhodium(I)trifluoromethanesulfonate (0.22 g) was dissolved in 2 mL of DCM and added to a solution of 2-tert-butoxycarbonylamino-3-{(S)-2-[3-(3,4-dichloro-benzyloxy)-phenyl]-2,3-dihydro-benzo[1,4]-dioxin-6-yl}-acrylic acid methyl ester (1.8 g) in 20 mL EtOAc. The mixture was then degassed and flushed with hydrogen and stirred under hydrogen atmosphere (balloon) for 1 hour. The solvent was then evaporated and the residue was purified by silica gel flash chromatography (DCM to 5% EtOAC in DCM) to get pure product 1.7 g. 1H NMR (400 MHz, CDCl3): 7.55 (d, 1H), 7.46 (d, 1H), 7.24-7.37 (m, 2H), 7.00-7.06 (m, 2H), 6.92-6.97 (m, 1H), 6.90 (d, 1H), 6.70 (d, 1H), 6.61-6.70 (m, 1H), 5.08 (m, 1H), 5.03 (d, 2H), 4.99 (d, 1H), 4.50-4.60 (m, 1H) 4.34 (m, 1H), 3.98 (m, 1H) 3.74 (s, 3H), 2.80-3.20 (m, 2H), 1.44 (s, 9H). LCMS (m/z): 589.

Workup

  1. customThe mixture was then degassed
  2. customflushed with hydrogen
  3. customThe solvent was then evaporated
  4. customthe residue was purified by silica gel flash chromatography (DCM to 5% EtOAC in DCM)

Sources & evidence

ORD record
ord-daaf3035021a480aba1a9b2f0b533b45
Source dataset
uspto-grants-2013_02
Patent number
US08383644B2

Reaction notes

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