1,2-Dichloroethane → 1-[4-(Thiazol-5-yl)-phenyl]-4(S)-hydroxy-2-(tert-butoxycarbonyl)amino-5(S)-N-(N-methoxycarbonyl-(L)-valyl)amino-6-phenyl-2-azahexane

Participants

Reaction Steps

Under a nitrogen atmosphere, 2.66 g (15.2 mmol) of N-methoxycarbonyl-(L)-valine, 5.46 g (28.5 mmol) of EDC and 2.57 g (19 mmol) of HOBT are dissolved in 42 ml of DMF. 7.9 ml (57 mmol) of TEA are added and after 20 min a solution of 4.46 g (9.5 mmol) of 1-[4-(thiazol-5-yl)-phenyl]-4(S)-hydroxy-2-(tert-butoxycarbonyl)amino-5(S)-amino-6-phenyl-2-azahexane (Example 2b) in 85 ml of DMF is added dropwise. After 1.5 hours, the reaction mixture is worked up analogously to Example 2c. Crystallisation from THF/ether yields the title compound: m.p: 114°-115° C.; HPLC20-100 : tRet =15.1; FAB MS (M+H)+ =626.

Provenance & Evidence