Dimethyl Sulfide → (2r,3s)-3-(Tritylamino)pentan-2-ol

HRID 705167Notes

Reaction equation

HRID 705167 reaction equation
S(C)C.[CH3:4][Li].[C:6]([NH:25][C@@H:26]([CH2:29][CH3:30])[CH:27]=[O:28])([C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)([C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)[C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1.[NH4+].[Cl-]>CCOCC>[C:6]([NH:25][C@@H:26]([CH2:29][CH3:30])[C@H:27]([OH:28])[CH3:4])([C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)([C:19]1[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=1)[C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1

Participants

6

Reactant 4

HCID 1068Dimethyl SulfideHCID 25517Ammonium ChlorideHCID 57452676(S)-2-(tritylamino)butanalHCID 178418348HCID 178418348, compound

Product 1

HCID 57433109(2r,3s)-3-(Tritylamino)pentan-2-ol

Reagents, catalysts & solvents 1

HCID 3283Diethyl EtherSolvent2×

Procedure

To a stirred suspension of CuBr.SMe2 (3 g, 14.6 mmol) in anhydrous ether (100 ml) under an argon atmosphere at −78° C., was added methyl lithium (1.6M in ether, 16.5 ml, 4.0 eq, 26.5 mmol) dropwise and the solution allowed to warm to room temperature over 1 h. The mixture was recooled to −78° C., and a solution of (S)-2-(trityl-amino)-butyraldehyde (2.2 g, 6.62 mmol) in ether (25 ml) was added dropwise with stirring. The reaction mixture was stirred at this temperature for 2 h then allowed to warm to room temperature over 1 h. A saturated aqueous solution of NH4Cl (50 ml) was added and the two layers separated. The organic phase was washed with brine (50 ml), dried (MgSO4) and evaporated in vacuo. The residue was purified by flash silica gel column chromatography, eluted with hexane:ethyl acetate (80:20) to afford (2R,3S)-3-(trityl-amino)-pentan-2-ol as a light yellow oil; Yield: 1.5 g (66%). (75% de 2R, 3S: 25% de 2S, 3S). 1H-NMR (d6-DMSO, 250 MHz): δ 0.0.47+0.55 (2×t, J=7.50+7.26 Hz —NHCH(CH2CH3)CH(CH3)OH), 0.99-1.12 (m, 5 H, —NHCH(CH2CH3)CH(CH3)OH), 2.01 (1 H, m, —NHCH(CH2CH3)CH(CH3)OH), 3.22-3.43 (m, 1H, —NHCH(CH2CH3)CH(CH3)OH), 4.41 [1 H, d, J=3.3, NHCH(CH2CH3)CH(CH3)OH], 7.14-7.56 (15 H, m, ArH). δC (250 MHz, CDCl3) 146.88 (C), 128.97 (6×CH), 127.83 (6×CH), 126.43 (3×CH), 71.03 (C), 68.13 (CH), 58.77 (CH), 23.09 (CH2), 17.88 (CH3), 10.47 (CH3)

Workup

  1. customwas recooled to −78° C.
  2. stirringThe reaction mixture was stirred at this temperature for 2 h
  3. temperatureto warm to room temperature over 1 h
  4. customthe two layers separated
  5. washThe organic phase was washed with brine (50 ml)
  6. dry with materialdried (MgSO4)
  7. customevaporated in vacuo
  8. customThe residue was purified by flash silica gel column chromatography
  9. washeluted with hexane:ethyl acetate (80:20)

Sources & evidence

ORD record
ord-16a27132826e48a4bf8723b3b6cbca02
Source dataset
uspto-grants-2015_11
Patent number
US09173938B2

Reaction notes

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