Methyl iodide → (2S)-tert-butyl 2-((2S,3R)-3-(3-chlorophenyl)-2-(4-chlorophenyl)-5-methyl-6-oxopiperidin-1-yl)butanoate

HRID 931951Notes

Reaction equation

HRID 931951 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]([C@H:8]2[CH2:13][CH2:12][C:11](=[O:14])[N:10]([C@@H:15]([CH2:23][CH3:24])[C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[C@@H:9]2[C:25]2[CH:30]=[CH:29][C:28]([Cl:31])=[CH:27][CH:26]=2)[CH:5]=[CH:6][CH:7]=1.IC.[CH3:34][Si]([N-][Si](C)(C)C)(C)C.[Li+]>C1COCC1>[Cl:1][C:2]1[CH:3]=[C:4]([C@H:8]2[CH2:13][CH:12]([CH3:34])[C:11](=[O:14])[N:10]([C@@H:15]([CH2:23][CH3:24])[C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[C@@H:9]2[C:25]2[CH:26]=[CH:27][C:28]([Cl:31])=[CH:29][CH:30]=2)[CH:5]=[CH:6][CH:7]=1

Participants

5

Reactant 3

HCID 6328Methyl iodideHCID 2733832Lithium HexamethyldisilazideHCID 68001176(S)-tert-butyl 2-((2S,3R)-3-(3-chlorophenyl)-2-(4-chlorophenyl)-6-oxopiperidin-1-yl)butanoate

Product 1

HCID 68000014(2S)-tert-butyl 2-((2S,3R)-3-(3-chlorophenyl)-2-(4-chlorophenyl)-5-methyl-6-oxopiperidin-1-yl)butanoate

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

To a solution of 11.2 g (24.2 mmol) of (S)-tert-butyl 2-((2S,3R)-3-(3-chlorophenyl)-2-(4-chlorophenyl)-6-oxopiperidin-1-yl)butanoate (Example 66, Step A) and iodomethane (1.813 mL, 29.1 mmol) in THF (120.0 mL) was added a lithium bis(trimethylsilyl)amide, (1M solution in THF; 26.6 mL, 26.6 mmol) at −78° C. The reaction was allowed to warm to R.T., then was quenched (sat. aqueous NH4Cl) and extracted (2×EtOAc). The combined organic layers were washed with water and sat. aq. NaCl solution, dried over Na2SO4, filtered and the filtrate was concentrated under reduced pressure. The residue was absorbed onto a plug of silica gel and purified by chromatography on silica gel, eluting with a gradient of 10% to 30% EtOAc in hexane, to provide the title compound as a mixture of stereoisomers.

Workup

  1. customwas quenched (sat. aqueous NH4Cl)
  2. extractionextracted (2×EtOAc)
  3. washThe combined organic layers were washed with water and sat. aq. NaCl solution
  4. dry with materialdried over Na2SO4
  5. filtrationfiltered
  6. concentrationthe filtrate was concentrated under reduced pressure
  7. customThe residue was absorbed onto a plug of silica gel
  8. custompurified by chromatography on silica gel
  9. washeluting with a gradient of 10% to 30% EtOAc in hexane

Sources & evidence

ORD record
ord-4c312bcd2c004e70af8c9e3c6ec2faed
Source dataset
uspto-grants-2016_03
Patent number
US09296736B2

Reaction notes

Loading…