反应详情

910 mg (1.68 mmol) of cis-1,3-dibenzyl-4-hydroxy-4-(4-(2,4,10-trioxaadamantyl)-butyl)-hexahydro-1H-thieno[3,4-d]imidazol-2-one (prepared in accordance with Example 1) are dissolved in 50 ml of toluene and the solution is treated with 20 mg of p-toluenesulphonic acid. The solution is heated to boiling and 20 ml of toluene are distilled off within 1 hour. Thereafter, the solution is evaporated to dryness. The residue remaining is chromatographed on silica gel. Elution with toluene, toluene/ethyl acetate (9:1) and (8:2) gives 839 mg (96% of theory) of cis-1,3-dibenzyl-4-(4-(2,4,10-trioxaadamantyl)-butylidene)-hexahydro-1H-thieno[3,4-d]imidazol-2-one in the form of a light brown oil which solidifies upon drying.

1. temperatureThe solution is heated
2. distillation20 ml of toluene are distilled off within 1 hour
3. customThereafter, the solution is evaporated to dryness
4. customThe residue remaining is chromatographed on silica gel
5. washElution with toluene, toluene/ethyl acetate (9:1) and (8:2)