Pictet-Spenglerreactions of m-tyramine and aldehydes producedtetrahydroisoquinolines in the presence of a catalytic amount of Ca[OCH(CF3)2]2. This reaction occurs with a variety of aryl, heteroaryl, and alkyl aldehydes, producingtetrahydroisoquinolines in high yield and with high regioselectivity. This calcium-promoted Pictet-Spenglerreaction provides a mild alternative to the traditional Bronsted