Cyclopentanol → HCID 54260599, compound

Participants

Reaction Steps

3.5 g (7.7 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, 10 g (116 mmol) of cyclopentanol and 0.8 g (3 mmol) of tetraethyl orthotitanate are stirred at 125° overnight, the solution obtained is evaporated and the residue is taken up in chloroform. The solution obtained is stirred for 0.5 hour with 40 ml of a saturated potassium fluoride solution, the resulting emulsion is filtered over siliceous earth, the organic phase is separated, washed with water, dried over magnesium sulphate and evaporated. By a rapid filtration through about 200 g of silica gel while eluting with ethyl acetate and subsequent crystallization from ethyl acetate there is obtained cyclopentyl (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 184°-185°.

Provenance & Evidence