反应详情

12 g (26.6 mmol) of tert.butyl (S)-12,12a-dihydro-8-iodo-9-oxo-9H,11H-azeto[2,1-c]imidazo[1,5-a][1,4]benzodiazepine-1-carboxylate, 70 ml (660 mmol) of cyclohexanol and 2 g (8 mmol) of tetraethyl orthotitanate are stirred at 120° overnight, the solution is evaporated to dryness and the residue is taken up in chloroform. The solution obtained is stirred for 0.5 hour with 120 ml of a saturated potassium fluoride solution, the resulting emulsion is filtered through siliceous earth, the organic phase is separated, washed with water, dried over magnesium sulphate and evaporated. By crystallization from ethyl acetate and hexane there is obtained cyclohexyl (S)-12,12a-dihydro-8-iodo-9-oxo-9H,11H-azeto[2,1-c]imidazo[1,5-a][1,4]benzodiazepine-1-carboxylate of melting point 124°-125°.

1. customthe solution is evaporated to dryness
2. customThe solution obtained
3. filtrationthe resulting emulsion is filtered through siliceous earth
4. customthe organic phase is separated
5. washwashed with water
6. dry with materialdried over magnesium sulphate
7. customevaporated
8. customBy crystallization from ethyl acetate and hexane