Реакция #44621

Уравнение реакции

4-Chlorophenyl magnesium bromide

tetrahydrofuran

(R)-5-oxopyrrolidin-1,2-dicarboxylic acid 1-tert-butyl ester 2-ethyl ester

→

title compound

(R)-2-tert-butoxycarbonylamino-5-(4-chlorophenyl)-5-oxopentanoic acid ethyl ester

Растворители

water

Условия реакции

Обработка

1. 1
   ДругоеThe resulting reaction solution
2. 2
   Температураwhile heating from −40° C. to 0° C. for 1 hr
3. 3
   ЭкстракцияThe reaction solution was extracted with ethyl acetate
4. 4
   ПромывкаThe extract solution was washed with saturated saline
5. 5
   Сушкаdried over anhydrous magnesium sulfate
6. 6
   Концентрированиеconcentrated under reduced pressure
7. 7
   ДругоеThe residue was purified by silica gel column chromatography (heptane-ethyl acetate system)

Методика

4-Chlorophenyl magnesium bromide (1.0 M diethylether solution, 17.1 mL) was dropwise added to a tetrahydrofuran solution (100 mL) of (R)-5-oxopyrrolidin-1,2-dicarboxylic acid 1-tert-butyl ester 2-ethyl ester (CAS Register No. 128811-48-3, 4.0 g) over 20 min at −40° C. The resulting reaction solution was stirred while heating from −40° C. to 0° C. for 1 hr. To this solution, water was gradually added at 0° C. The reaction solution was extracted with ethyl acetate. The extract solution was washed with saturated saline, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (heptane-ethyl acetate system) to give 5.6 g of the title compound as a colorless oily substance. The physical property values of this compound were as follows:

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