Disclosed is a process for the preparation of a compound of the formula (1) wherein R.sub.1 is unsubstituted or substituted sing reacting a compound of the formula (2) with a compound of the formula (3) in the presence of an aqueous base ransfer catalyst.

Показан процесс для подготовки смеси формулы (1) при котором R.sub.1 unsubstituted или заменено спейте реагировать смесь формулы (2) с смесью формулы (3) in the presence of водяной низкопробный катализатор ransfer.