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Diastereoselective synthesis of spiro[indene-2,2′-pyrazolo[1,2-a]pyrazoles] and spiro[indoline-3,2′-pyrazolo[1,2-a]pyrazoles] via 1,3-dipolar cycloaddition†
Yu-Ling Lu,Jing Sun,Yan-Hong Jiang,Chao-Guo Yan
RSC Advances Pub Date : 05/20/2016 00:00:00 , DOI:10.1039/C6RA02358D
Abstract

The 1,3-dipolar cycloaddition of cyclic azomethine imines with 2-arylideneindene-1,3-diones in refluxing acetonitrile afforded predominately cis-1,3-diaryl-substituted spiro[indene-2,2′-pyrazolo[1,2-a]pyrazole] derivatives in good yields. Significantly, the similar cycloaddition reaction of cyclic azomethine imines with 3-phenacylideneoxindoles gave polysubstituted spiro[indoline-3,2′-pyrazolo[1,2-a]pyrazoles] in good yields and with high diastereoselectivity.

Graphical abstract: Diastereoselective synthesis of spiro[indene-2,2′-pyrazolo[1,2-a]pyrazoles] and spiro[indoline-3,2′-pyrazolo[1,2-a]pyrazoles] via 1,3-dipolar cycloaddition
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