Reacción #50186

Ecuación de reacción

methyl-(4-cyano-4-ethoxycarbonylbutyl)benzoate

methyl 4-(-hydroxypropyl)benzoate

ethyl cyanoacetate

triphenylphosphine

diethyl azodicarboxylate

→

methyl 4-(4-cyano-4-ethoxycarbonylbutyl)benzoate

Rendimiento 40.0%

Disolventes

tetrahydrofuran

THF

Condiciones de reacción

Tratamiento posterior

1. 1
   Temperaturaflame
2. 2
   Otrodried round bottom flask
3. 3
   workup.ADDITIONAfter the addition
4. 4
   OtroThe volatiles were removed in vacuo
5. 5
   workup.DISSOLUTIONthe crude oil was dissolved in 300 mL of EtOAc
6. 6
   Lavadowashed with brine
7. 7
   Secadodried over Na2SO4
8. 8
   Otroremoved in vacuo
9. 9
   OtroThis crude oil was then purified on silica gel using a Waters Prep LC 2000 eluting with a gradient of 1:1 MeCl2 /Hex to 100% MeCl2

Procedimiento

Preparation of methyl-(4-cyano-4-ethoxycarbonylbutyl)benzoate ##STR21## To a 250 mL flame dried round bottom flask were charged 10.0 g (51.5 mmol) of methyl 4-(-hydroxypropyl)benzoate and 5.48 mL (51.5 mmol) of ethyl cyanoacetate dissolved in 40 mL of anhydrous tetrahydrofuran (THF). To this solution was then added dropwise to a solution of 20.2 g (77 mmol) of triphenylphosphine and 12.1 mL (77 mmol) of diethyl azodicarboxylate dissolved in 60 mL of anhydrous THF. After the addition, the reaction was stirred at ambient temperature for 1.5 hours. The volatiles were removed in vacuo and the crude oil was dissolved in 300 mL of EtOAc, washed with brine, dried over Na2SO4, and removed in vacuo. This crude oil was then purified on silica gel using a Waters Prep LC 2000 eluting with a gradient of 1:1 MeCl2 /Hex to 100% MeCl2 to give 6.0 g (40%) of methyl 4-(4-cyano-4-ethoxycarbonylbutyl)benzoate as a pale yellow oil.

Fuente