Catalytic Asymmetric [3+3] Cycloaddition of Azomethine Ylides with C3-Substituted 2-Indolylmethanols.

The first catalytic asymmetric [3+3] cycloaddition of azomethine ylides with C3-substituted 2-indolylmethanols has been established, leading to diastereo- and enantioselective construction of a tetrahydropyrimido[1,6-a]indole framework (up to 91% yield, >95:5 dr, 98:2 er). This reaction also represents a new type of catalytic enantioselective [3+3] cycloaddition using azomethine ylides. [ABSTRACT FROM AUTHOR]