反应详情

A mixture of 9.8 g of the product of Step D, 90 ml of ethanol and 28 ml of ethanolic 2N hydrogen chloride was refluxed with stirring for one hour and then evaporated to dryness under reduced pressure to obtain 11.9 g of product which was crystallized from ethyl acetate to obtain 7.55 g of the desired product melting at 90° C.

1. temperaturewas refluxed
2. customevaporated to dryness under reduced pressure