Protection of nitrogen atom of heterocyclic molecules, such as indole and pyrrole types, enables various reactions of these systems. N-Phenylsulfonyl derivatives, which have been widely used for this purpose, were prepared in the indole series by the reaction of N-sodium and N-lithium salts with benzenesulfonyl chloride. This method requires waterfree and oxygenfree conditions. On the other hand, the phase transfer catalysis conditions used in this work obviates these disadvantages. We therefore selected the latter method for the preparation of variously substituted 4-phenylsulfonylfuro[3,2-b]pyrroles (I - VII) and 1-phenylsulfonylbenzo[b]furo[3,2-b]pyrroles (VIII - IX).
保护杂环分子中的氮原子,如吲哚和吡咯类,可以使这些系统发生各种反应。已广泛用于此目的的N-苯磺酰衍生物,通过N-钠和N-锂盐与苯磺酰氯反应制备吲哚系列中。该方法需要无水和无氧条件。另一方面,本研究中使用的相转移催化条件消除了这些缺点。因此,我们选择了后一种方法来制备不同取代的4-苯磺酰基呋喃[3,2-b]吡咯(I-VII)和1-苯磺酰基苯并[ b]呋喃[3,2-b]吡咯(VIII-IX)。