Cite

    Guodong Zhu et al.. “Catalytic asymmetric construction of spiro[pyrrolidine-2, 3′-oxindole] scaffolds through chiral phosphoric acid-catalyzed 1, 3-dipolar cycloaddition involving 3-amino oxindoles.” Chemical communications, vol. 51, no. 85, 2015, pp. 15510–15513. http://access.bl.uk/ark:/81055/vdc_100029143058.0x000025