Building block used as a precursor to the synthesis of azaspiro[3.4]octanes developed in the Carreira group. This substrate can be readily functionalized via enolization at the 3-position in the presence of LDA. Building block used as a precursor to the synthesis of azaspiro[3.4]octanes developed in the Carreira group. This substrate can be readily functionalized via enolization at the 3-position in the presence of LDA.