反应 #220123

反应方程式

(4S,5S)-4-(3,5-difluorobenzyl)-5-((2R,4R)-1-benzhydryl-4-hydroxypyrrolidin-2-yl)oxazolidin-2-one

triphenylphosphine

DEAD

( 1 )

(4S,5S)-4-(3,5-difluorobenzyl)-5-((2R,4R)-4-(allyloxy)-1-benzhydrylpyrrolidin-2-yl)oxazolidin-2-one

(3S,5R)-5-((4S,5S)-4-(3,5-difluorobenzyl)-2-oxooxazolidin-5-yl)-1-benzhydrylpyrrolidin-3-yl acetate

Acetic acid

→

title compound

收率 81.0%

(4S,5S)-4-(3,5-difluorobenzyl)-5-((2R,4S)-1-benzhydryl-4-hydroxypyrrolidin-2-yl)oxazolidin-2-one

收率 81.0%

溶剂

THF

THF

ethyl acetate hexane

反应条件

后处理

1. 1
   workup.WAITto come to rt for 5 min
2. 2
   温度was again cooled to 0° C
3. 3
   温度the mixture was warmed to rt
4. 4
   workup.ADDITIONbuffer was added
5. 5
   萃取the mixture was extracted with ethyl acetate
6. 6
   洗涤The combined organic phases were washed with sat. aqueous NaCl
7. 7
   干燥dried (MgSO4)
8. 8
   浓缩concentrated in vacuo

实验过程

Step K (1): (3S,5R)-5-((4S,5S)-4-(3,5-difluorobenzyl)-2-oxooxazolidin-5-yl)-1-benzhydrylpyrrolidin-3-yl acetate. To a solution of triphenylphosphine (510 mg, 1.94 mmol) in THF (20 mL) at 0° C. was added DEAD (0.36 mL, 1.94 mmol) and the mixture was allowed to come to rt for 5 min and was again cooled to 0° C. A solution of (4S,5S)-4-(3,5-difluorobenzyl)-5-((2R,4R)-1-benzhydryl-4-hydroxypyrrolidin-2-yl)oxazolidin-2-one (Preparation J, 750 mg, 1.62 mmol) in THF (20 mL) was added and the mixture was allowed to come to rt for 5 min and was again cooled to 0° C. Acetic acid (0.093 mL, 1.62 mmol) was added and the mixture was warmed to rt and stirred for 30 min. pH 7 buffer was added and the mixture was extracted with ethyl acetate. The combined organic phases were washed with sat. aqueous NaCl, dried (MgSO4), and concentrated in vacuo. Flash chromatography (silica gel, 5-100% ethyl acetate/hexane) gave 661 mg (81% yield) of the title compound as a clear, very slightly yellow oil: 1H NMR (CDCl3, 500 MHz) δ 1.31-1.34 (1H, m), 2.08-2.16 (1H, m), 2.39 (3H, m), 2.80 (1H, brd s), 3.26 (1H, brd s), 3.60 (2H, brd s), 4.11 (1H, m), 4.27-4.33 (1H, m), 4.91 (2H, m), 5.28 (1H, m), 6.40 (2H, brd s), 6.51 (2H, m), 6.69 (1H, m), 7.22 (1H, m), 7.28-7.49 (8H, m). HPLC retention time: 1.50 min (method A). MS (ESI) (M+H)+ 507.17.

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