반응 #168728

반응 방정식

[5-(5-bromo-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester

trans-N,N′-dimethylcyclohexane-1,2-diamine

sodium azide

sodium-ascorbate

→

desired product

[5-(5-Azido-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester

용매

EtOH

water

water

TBME

반응 조건

후처리

1. 1
   기타The mixture was degassed
2. 2
   온도The mixture was cooled to rt
3. 3
   세척The organic phase was washed with brine
4. 4
   건조dried with MgSO4.H2O
5. 5
   기타The crude product was purified by chromatography on silica gel (hexane/5-8% TBME)

실험 절차

To a solution of 7.27 g (17.18 mmol) [5-(5-bromo-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester and 2.443 g (17.18 mmol) trans-N,N′-dimethylcyclohexane-1,2-diamine in 237 ml EtOH was added a solution of 8.93 g (137 mmol) sodium azide and 1.361 g (6.87 mmol) sodium-ascorbate in 102 ml water. The mixture was degassed and brought under nitrogen atmosphere. CuI (1.309 g, 6.87 mmol) was added and the mixture was heated at 70° C. The initially formed suspension turned into a homogeneous blue solution. The mixture was cooled to rt, diluted with water and TBME. The organic phase was washed with brine and dried with MgSO4.H2O. The crude product was purified by chromatography on silica gel (hexane/5-8% TBME) to give the desired product as a colorless solid.

출처