تفاعل #1173

معادلة التفاعل

phthalimide

N-Cbz-piperidine

DEAD

triphenylphosphine

→

1-benzyloxycarbonyl-4-phthalimidylpiperidine

المردود 50.0%

المذيبات

THF

THF

ظروف التفاعل

المعالجة

1. 1
   أخرىwas quenched with water
2. 2
   استخلاصextracted with EtOAc (3×)
3. 3
   غسيلthe combined extracts washed with brine solution
4. 4
   تجفيفdried over Na2SO4
5. 5
   تركيزconcentrated
6. 6
   أخرىto give the crude product
7. 7
   أخرىPurification of this material by chromatography (hexanes/EtOAc; 2:1)

الإجراء التجريبي

A solution of DEAD (1.61 mL, 10.2 mmol) in 20 mL of THF was added to a solution of triphenylphosphine (2.69 g, 10.3 mmol), the N-Cbz-piperidine prepared in Example 16A (2.36 g, 100 mmol) and phthalimide (1.50 g, 10.2 mmol) in 80 mL of THF. After stirring 10.5 h at R.T. the mixture was quenched with water, extracted with EtOAc (3×) and the combined extracts washed with brine solution, dried over Na2SO4 and concentrated to give the crude product. Purification of this material by chromatography (hexanes/EtOAc; 2:1) gave 1.81 g, (50%) of 1-benzyloxycarbonyl-4-phthalimidylpiperidine. [1H]-NMR(CDCl3) consistent with structure.

المصدر