تفاعل #52951

معادلة التفاعل

NH4Cl

N-(2,6-dichlorobenzoyl)-O-(trifluoromethane sulfonyl)-L-tyrosine methyl ester

trimethyl(2-cyano-3-thienyl)tin

LiCl

→

N-(2,6-dichlorobenzoyl)-4-(2-cyano-3-thienyl)-L-phenylalanine methyl ester

المردود 38.0%

المذيبات

AcOEt

dioxane

ظروف التفاعل

المعالجة

1. 1
   workup.STIRRINGAfter stirring at room temperature for 1 h
2. 2
   ترشيحthe mixture was filtered through Celite
3. 3
   غسيلwashed with AcOEt
4. 4
   غسيلThe combined organic layers were washed successively with water and brine
5. 5
   تجفيفdried (MgSO4)
6. 6
   أخرىevaporated under reduced pressure
7. 7
   أخرىThe residue was purified by silica gel chromatography

الإجراء التجريبي

A mixture of N-(2,6-dichlorobenzoyl)-O-(trifluoromethane sulfonyl)-L-tyrosine methyl ester (361 mg), trimethyl(2-cyano-3-thienyl)tin (393 mg), Pd(PPh3)4 (42 mg) and LiCl (93 mg) in dioxane (8 mL) was stirred at 100° C. under N2 for 38 h. The mixture was diluted with AcOEt and treated with 10% NH4Cl aqueous solution (6 mL). After stirring at room temperature for 1 h, the mixture was filtered through Celite and washed with AcOEt. The combined organic layers were washed successively with water and brine, dried (MgSO4) and evaporated under reduced pressure. The residue was purified by silica gel chromatography to afford N-(2,6-dichlorobenzoyl)-4-(2-cyano-3-thienyl)-L-phenylalanine methyl ester (126 mg). ESMS m/z 481 (M++Na), 459 (MH+), 457 (M−H)−.

المصدر