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First total synthesis of the proposed structures of β-indoloquinazoline alkaloids orisuaveolines A and B is reported. The key steps of the synthesis included a Pictet-Spengler reaction to build a six-member lactam which further transformed into target molecular by a one-pot condensation. This synthesis provided an access to the proposed structures of orisuaveolines A and B in a short and convenient manner from inexpensive, commercially available starting materials. The structures of our synthesized products were confirmed by 2D-NMR experiments. [ABSTRACT FROM AUTHOR]

The key step in the synthesis of orisuaveolines A (VII) and B (V) is a Pictet-Spengler-type cyclization. [ABSTRACT FROM AUTHOR]