反应详情

To an ice cooled solution of the free base prepared from 1.5 g. of 3',4'-dihydrospiro[cyclohexane-1,2'(1'H)-naphthalen]-4-ylamine hydrochloride [I(c)] (prepared as in Example 10C) in 12 ml. of pyridine, 1 ml. of ethyl chloroformate is added. The mixture is allowed to stand in the cold for about 5 hours and then poured into ice water. The solid that precipitates is collected on a filter and recrystallized from methylene chloride: benzene to give ethyl 3',4'-dihydrospiro[cyclohexane-1,2'(1'H)-naphthalene]-4-carbamate [I(c)].

1. customcold for about 5 hours
2. customThe solid that precipitates
3. customis collected on
4. filtrationa filter
5. customrecrystallized from methylene chloride