反应详情

A mixture of 5.0 g (11.0 mmol) of Compound 61 obtained in Example 24 and 2.1 g (11.0 mmol) of p-toluenesulfonic acid monohydrate was heated in 120 ml of ethanol, so that the latter compounds were dissolved. The resultant mixture was allowed to cool down, whereby 6.5 g of the title compound were obtained as colorless crystals (yield: 92%).

1. dissolutionwere dissolved
2. temperatureto cool down