Trifluoroacetic acid → N-{[4-((2R,3R)-1-(4-fluorophenyl)-3-([2-(4-fluorophenyl)-2-hydroxyethyl]thio}-4-oxoazetidin-2-yl)phenoxy]acetyl}-D-serine

HRID 254116Notes

Reaction equation

HRID 254116 reaction equation
[F:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]2[C:11](=[O:12])[C@H:10]([S:13][CH2:14][C:15]([C:17]3[CH:22]=[CH:21][C:20]([F:23])=[CH:19][CH:18]=3)=[O:16])[C@H:9]2[C:24]2[CH:34]=[CH:33][C:27]([O:28]CC(O)=O)=[CH:26][CH:25]=2)=[CH:4][CH:3]=1.Cl.C([O:40][C:41](=[O:50])[C@@H:42]([CH2:44][O:45]C(C)(C)C)[NH2:43])(C)(C)C.CN1CC[O:55][CH2:54][CH2:53]1.CN(C(ON1N=NC2C=CC=CC1=2)=[N+](C)C)C.[B-](F)(F)(F)F.C(O)(C(F)(F)F)=O>C(Cl)Cl>[F:1][C:2]1[CH:3]=[CH:4][C:5]([N:8]2[C:11](=[O:12])[C@H:10]([S:13][CH2:14][CH:15]([C:17]3[CH:18]=[CH:19][C:20]([F:23])=[CH:21][CH:22]=3)[OH:16])[C@H:9]2[C:24]2[CH:25]=[CH:26][C:27]([O:28][CH2:53][C:54]([NH:43][C@@H:42]([C:41]([OH:40])=[O:50])[CH2:44][OH:45])=[O:55])=[CH:33][CH:34]=2)=[CH:6][CH:7]=1

Participants

7

Reactant 5

HCID 6422Trifluoroacetic acidHCID 79724-MethylmorpholineHCID 2733207O-(Benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborateHCID 56777372H-D-Ser(tBu)-OtBu.HClHCID 66842813[4-((2R,3R)-1-(4-Fluorophenyl)-3-{[2-(4-fluorophenyl)-2-oxoethyl]thio}-4-oxoazetidin-2-yl)phenoxy]acetic acid

Product 1

HCID 66842695N-{[4-((2R,3R)-1-(4-fluorophenyl)-3-([2-(4-fluorophenyl)-2-hydroxyethyl]thio}-4-oxoazetidin-2-yl)phenoxy]acetyl}-D-serineYield 36%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A solution of [4-((2R,3R)-1-(4-fluorophenyl)-3-{[2-(4-fluorophenyl)-2-oxoethyl]thio}-4-oxoazetidin-2-yl)phenoxy]acetic acid (0.050 g, 0.103 mmol), O-(tert-butyl)-D-serine tert-butyl ester hydrochloride (0.032 g, 0.147 mmol) and N-methylmorpholine (0.035 ml, 0.318 mmol) in DCM (4 ml) was stirred for 5 min. TBTU (0.044 g, 0.137 mmol) was added. The formation of the ester was confirmed after 3 h. M/z: 683.1. TFA (2 ml) was added and the mixture was stirred for 22 h. The solvent was removed under reduced pressure. The residue was dissolved in MeOH (4 ml) and NaBH4 (totally 0.130 g, 3.44 mmol) was added in small portions. The reaction was quenched by the addition of 0.1M ammonium acetate buffer (3 ml). The methanol was removed under reduced pressure. The remaining solution was purified by preparative HPLC using a gradient of 20-60% MeCN in 0.1M ammonium acetate buffer as eluent. After freeze-drying, 0.021 g (36% yield) of the title product was obtained as a white solid. M/z: 573.1. 1H NMR (DMSO, 400 MHz): δ 2.84-2.96 (m, 2H), 3.47 (dd, 1H), 3.69 (dd, 1H), 3.97-4.06 (m, 1H), 4.27-4.32 (m, 1H), 4.52 (ABq, 2H), 4.68-4.77 (m, 1H), 5.04-5.09 (m, 1H), 5.65 (bs, 1H), 6.99 (d, 2H), 7.07-7.41 (m, 10H), 7.89 (d, 1H).

Workup

  1. customThe solvent was removed under reduced pressure
  2. dissolutionThe residue was dissolved in MeOH (4 ml)
  3. additionNaBH4 (totally 0.130 g, 3.44 mmol) was added in small portions
  4. customThe reaction was quenched by the addition of 0.1M ammonium acetate buffer (3 ml)
  5. customThe methanol was removed under reduced pressure
  6. customThe remaining solution was purified by preparative HPLC
  7. customAfter freeze-drying

Sources & evidence

ORD record
ord-8b756213de1c41378bbedef21525902b
Source dataset
uspto-grants-2011_01
Patent number
US07871998B2

Reaction notes

Loading…