Reaktion #659030

Reaktionsgleichung

ethyldiisopropylamine

2-(trifluoromethyl)-4-pyridinecarboxylic acid

(R)-2-(4-Amino-2-fluoro-phenyl)-morpholine-4-carboxylic acid tert-butyl ester

→

(R)-2-{2-Fluoro-4-[(2-trifluoromethyl-pyridine-4-carbonyl)-amino]-phenyl}-morpholine-4-carboxylic acid tert-butyl ester

Lösungsmittel

DMF

CH2Cl2

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONwas added
2. 2
   ExtraktionThe RM was extracted with EtOAc and 1M citric acid solution
3. 3
   Trocknenthe organic phase was dried over MgSO4
4. 4
   Filtrationfiltered
5. 5
   Einengenconcentrated in vacuo
6. 6
   SonstigeThe crude material was purified by flash chromatography (silica gel, 10 g, 10% to 50% EtOAc in heptane)

Vorschrift

Under N2, 2-(trifluoromethyl)-4-pyridinecarboxylic acid (CAS 131747-41-6) (64.4 mg, 337 μmol, Eq: 1.00) was dissolved in CH2Cl2 (1 ml). 1-chloro-N,N2-trimethypropenylamine (51.8 mg, 51.3 μl, 388 μmol, Eq: 1.15) was added dropwise. After 30 minutes at RT, a solution contained (R)-2-(4-Amino-2-fluoro-phenyl)-morpholine-4-carboxylic acid tert-butyl ester (100 mg, 337 μmol, Eq: 1.00) and ethyldiisopropylamine (109 mg, 140 μl, 842 μmol, Eq: 2.5) in DMF (1.00 ml) was added. The RM was stirred at RT over 1 hour. Control with TLC: the reaction was finished. The RM was extracted with EtOAc and 1M citric acid solution; the organic phase was dried over MgSO4; filtered; concentrated in vacuo. The crude material was purified by flash chromatography (silica gel, 10 g, 10% to 50% EtOAc in heptane) leading to 149 mg (82%) of a white foam. MS (EIC): 468.1 ([M−H]−)

Quelle