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The synthetic value of the present protocol is demonstrated by synthesis of (IX), the enantiomer of which is a potent orally active antihypertensive agent. [ABSTRACT FROM AUTHOR]

Asymmetric Pictet-Spengler reaction of tryptamine derivatives (II) with a diversity of aromatic and aliphatic aldehydes proceeds efficiently in the presence of SPINOL-phosphoric acids as organocatalysts. [ABSTRACT FROM AUTHOR]