A simple and efficient procedure was developed for the preparation of a variety of aryl, hetero aryl and alkyl N-sulfinylimines (2b-2u) with excellent yields (85–94%) using tungstophosphoric acid as catalyst. Also, this new synthetic protocol features high conversion, shorter reaction time, a straight forward and simple work up procedure. Catalyst was recycled for 10 times without much loss in activity and also scaled up in gram level with high yield. Hence, it is highly applicable for the industrial scale up process.

中文翻译：

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可回收的钨磷酸催化对映体纯的芳基，杂芳基和烷基亚磺酰亚胺的合成

开发了一种简单有效的方法，使用钨磷酸作为催化剂，可制备多种芳基，杂芳基和烷基N-亚磺酰亚胺（2b-2u），并具有优异的收率（85-94％）。而且，这种新的合成方案具有高转化率，更短的反应时间，简单明了的后处理程序。催化剂循环使用了10次，活性没有太大损失，并且以克为单位进行了放大，收率很高。因此，它非常适用于工业规模放大过程。