Search for "Clauson–Kaas pyrrole synthesis" in Full Text gives 2 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2023, 19, 928–955, doi:10.3762/bjoc.19.71
Beilstein J. Org. Chem. 2008, 4, No. 3, doi:10.1186/1860-5397-4-3