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Synthesis of six-membered spirooxindoles via a chiral Brønsted acid-catalyzed asymmetric intramolecular Friedel–Crafts reaction†
Hui-Xuan Chen,Yaqi Zhang,Yuyang Zhang,Xuefeng He,Hao Liang,Wenhuan He,Xiaoding Jiang,Xiangmeng Chen,Liqin Qiu
RSC Advances Pub Date : 11/01/2018 00:00:00 , DOI:10.1039/C8RA06710D
Abstract

By means of the direct condensation of N-aminoethylpyrroles and isatins, followed by a chiral phosphoric acid-catalyzed asymmetric intramolecular Friedel-Crafts reaction, a new class of valuable chiral 3′,4′-dihydro-2′H-spiro[indoline-3,1′-pyrrolo[1,2-a]pyrazin]-2-ones bearing a quaternary carbon stereocenter were successfully synthesized in good to excellent yields and with moderate to good enantioselectivities under mild reaction conditions.

Graphical abstract: Synthesis of six-membered spirooxindoles via a chiral Brønsted acid-catalyzed asymmetric intramolecular Friedel–Crafts reaction
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