First Synthesis of (R)- and (S)-1,2,3,4-Tetrahydroisoquinoline-3-phosphonic Acid (TicP) Using a Pictet-Spengler Reaction.

The authors thank Consejo Nacional de Ciencia y Tecnologia (CONACYT) for financial support through projects 181816 and 248868, the Ministerio de Ciencia e Innovacion – FEDER (grant CTQ2010-17436), and the Gobierno de Aragon-FSE (research group E40).