Magnesium → (2S,4R)-2-methyl 1-(2-(trimethylsilyl)ethyl) 4-(5'-chloro-2'-vinylbiphenyl-4-yl)-4-hydroxypyrrolidine-1,2-dicarboxylate

HRID 1043426Notes

Reaction equation

HRID 1043426 reaction equation
[Mg].Br[C:3]1[CH:8]=[CH:7][C:6]([C:9]2[CH:14]=[C:13]([Cl:15])[CH:12]=[CH:11][C:10]=2[CH:16]=[CH2:17])=[CH:5][CH:4]=1.[O:18]=[C:19]1[CH2:23][N:22]([C:24]([O:26][CH2:27][CH2:28][Si:29]([CH3:32])([CH3:31])[CH3:30])=[O:25])[C@H:21]([C:33]([O:35][CH3:36])=[O:34])[CH2:20]1>C1COCC1.C(Cl)Cl>[Cl:15][C:13]1[CH:12]=[CH:11][C:10]([CH:16]=[CH2:17])=[C:9]([C:6]2[CH:7]=[CH:8][C:3]([C@@:19]3([OH:18])[CH2:23][N:22]([C:24]([O:26][CH2:27][CH2:28][Si:29]([CH3:32])([CH3:30])[CH3:31])=[O:25])[C@H:21]([C:33]([O:35][CH3:36])=[O:34])[CH2:20]3)=[CH:4][CH:5]=2)[CH:14]=1

Participants

6

Reactant 3

HCID 5462224Magnesium3×HCID 59266363(S)-2-methyl 1-(2-(trimethylsilyl)ethyl) 4-oxopyrrolidine-1,2-dicarboxylateHCID 592665224'-Bromo-5-chloro-2-vinylbiphenyl

Product 1

HCID 59266523(2S,4R)-2-methyl 1-(2-(trimethylsilyl)ethyl) 4-(5'-chloro-2'-vinylbiphenyl-4-yl)-4-hydroxypyrrolidine-1,2-dicarboxylateYield 14%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 8028TetrahydrofuranSolvent2×

Procedure

Magnesium (0.298 g, 12.27 mmol) was stirred in a round bottom flask under nitrogen for 15 min. to cause scratching of the surface of the magnesium turnings. 10 mL of THF was added to the magnesium turnings and stirred for an additional 30 min. 4′-bromo-5-chloro-2-vinylbiphenyl (3.43 g, 11.68 mmol) in THF (60 mL), was added in dropwise at reflux with vigorous stirring. The Grignard solution was added to a solution of (S)-2-methyl 1-(2-(trimethylsilyl)ethyl) 4-oxopyrrolidine-1,2-dicarboxylate (3.35 g, 11.67 mmol) in DCM (60 mL) at r.t. and stirred for 1 hr and then quenched with saturated NH4Cl solution. The aqueous layer was extracted with DCM and the combined organics were dried, filtered and evaporated to give crude material. The crude material was purified by flash chromatography on the Biotage (10-40% EtOAc:Hex) to give (2S,4R)-2-methyl 1-(2-(trimethylsilyl)ethyl) 4-(5′-chloro-2′-vinylbiphenyl-4-yl)-4-hydroxypyrrolidine-1,2-dicarboxylate (800 mg, 1.593 mmol, 14% yield) as a yellow oil. 1H NMR (500 MHz, CHLOROFORM-d) δ ppm 0.04 (s, 9H) 1.03 (dd, j=9.46, 7.63 Hz, 2H) 2.30-2.48 (m, 1H) 2.63-2.79 (m, 1H) 3.77-3.80 (m, 1H) 3.82-3.86 (m, 3H) 3.95-4.05 (m, 1H) 4.16-4.26 (m, 2H) 4.51-4.67 (m, 1H) 5.20 (d, J=11.90 Hz, 1H) 5.67 (d, J=17.40 Hz, 1H) 6.61 (dd, J=17.40, 10.99 Hz, 1H) 7.26-7.35 (m, 4H) 7.49-7.58 (m, 3H).

Workup

  1. temperatureat reflux with vigorous stirring
  2. stirringstirred for 1 hr
  3. customquenched with saturated NH4Cl solution
  4. extractionThe aqueous layer was extracted with DCM
  5. customthe combined organics were dried
  6. filtrationfiltered
  7. customevaporated
  8. customto give crude material
  9. customThe crude material was purified by flash chromatography on the Biotage (10-40% EtOAc:Hex)

Sources & evidence

ORD record
ord-65d2ee8843f744c3aafd2735a2002595
Source dataset
uspto-grants-2013_10
Patent number
US08563505B2

Reaction notes

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