反応 #169569

反応方程式

H2O2

tert-butyl (S)-3-((R)-4-benzyl-2-oxooxazolidin-3-yl)-2-(4-chlorophenyl)-3-oxopropylcarbamate

2,4-dimethoxybenzaldehyde

Na2SO3

→

(S)-3-(tert-butoxycarbonylamino)-2-(4-chlorophenyl)propanoic acid

収率 94.2%

溶媒

H2O

THF

THF

反応条件

後処理

1. 1
   温度cooled to 0° C
2. 2
   workup.ADDITIONA solution containing
3. 3
   workup.ADDITIONwas added dropwise by addition funnel
4. 4
   その他The reaction mixture was placed in an ice bath
5. 5
   温度to slowly warm the reaction mixture and it
6. 6
   workup.STIRRINGwas stirred overnight
7. 7
   温度The reaction mixture was then cooled to 0° C.
8. 8
   workup.STIRRINGThe mixture was stirred for 5 minutes
9. 9
   温度warmed to room temperature
10. 10
    workup.STIRRINGwhile being stirred for 20 minutes
11. 11
    その他The reaction mixture was then transferred to a separatory funnel
12. 12
    洗浄washed with ether (3×)
13. 13
    抽出the mixture was extracted with DCM (2×)
14. 14
    乾燥The combined extracts were dried (Na2SO4)
15. 15
    ろ過filtered
16. 16
    濃縮concentrated

実験手順

35% H2O2 (0.240 mL, 2.91 mmol) was added to a solution of LiO—H2O (0.0978 g, 2.33 mmol) in 2:1 THF:H2O (33 mL). The reaction mixture was stirred at room temperature for 35 minutes and then cooled to 0° C. A solution containing a mixture of tert-butyl (S)-3-((R)-4-benzyl-2-oxooxazolidin-3-yl)-2-(4-chlorophenyl)-3-oxopropylcarbamate (0.535 g, 1.17 mmol) and 2,4-dimethoxybenzaldehyde (0.194 g, 1.17 mmol) in THF (7 mL) was added dropwise by addition funnel. The reaction mixture was placed in an ice bath to slowly warm the reaction mixture and it was stirred overnight. The reaction mixture was then cooled to 0° C., and 1M Na2SO3 (7 mL) was added to the mixture. The mixture was stirred for 5 minutes and then warmed to room temperature while being stirred for 20 minutes. The reaction mixture was then transferred to a separatory funnel and washed with ether (3×). The aqueous layer was acidified with KHSO4(s), and the mixture was extracted with DCM (2×). The combined extracts were dried (Na2SO4), filtered, and concentrated to give (S)-3-(tert-butoxycarbonylamino)-2-(4-chlorophenyl)propanoic acid (0.329 g, 94.2% yield) as a white residue. LC/MS (APCI+) m/z 200 [M−BOC+H]+.

出典