Synfacts, Table of Contents Synfacts 2020; 16(02): 0211DOI: 10.1055/s-0039-1691609 Organo- and Biocatalysis © Georg Thieme Verlag Stuttgart · New York Asymmetric Brønsted Acid Catalyzed Oxa-Pictet–Spengler Reactions of Tryptophols with Ketals Contributor(s): Benjamin List , Mathias Turberg Recommend Article Abstract Buy Article Key words Key wordsoxa-Pictet–Spengler reaction - oxocarbenium ions - Brønsted acid catalysis - tryptophols - ketals - pyranoindoles Full Text