Search for "spiropyrrolidine" in Full Text gives 3 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2018, 14, 1778–1805, doi:10.3762/bjoc.14.152
Beilstein J. Org. Chem. 2016, 12, 2893–2897, doi:10.3762/bjoc.12.288
Beilstein J. Org. Chem. 2014, 10, 352–360, doi:10.3762/bjoc.10.33