Nano n‐propylsulfonated γ‐Al2O3 is easily prepared by the reaction of nano γ‐Al2O3 with 1,3‐propanesultone. This reagent can be used as an efficient catalyst for the synthesis of spiro [indoline‐3,4‐pyrazolo[3,4‐e][1,4]thiazepine]diones in aqueous media. This new method consistently has the advantages of excellent yields and short reaction times. Further, the catalyst can be reused and recovered several
纳米Ñ -propylsulfonated的γ-Al 2 ö 3很容易通过纳米的γ-Al的反应制备2 ö 3与
1,3-丙磺酸内酯。该试剂可用作在
水性介质中合成螺[
吲哚啉-3,4-
吡唑并[3,4- e ] [1,4]噻氮平]二酮的有效催化剂。这种新方法始终具有优异的收率和较短的反应时间的优点。此外,催化剂可以重复使用和回收几次。版权所有©2013 John Wiley&Sons,Ltd.