作者:Carine Guérot、Boris H. Tchitchanov、Henner Knust、Erick M. Carreira
DOI:10.1021/ol103050c
日期:2011.2.18
The syntheses of a variety of novel angular azaspiro[3.3]heptanes are reported. gem-Difluoro and gem-dimethyl variants of the angular 1,6-diazaspiro[3.3]heptane module were prepared in high yields using efficient sequences. Additionally, a practical one-pot synthesis of 5-oxo-2-azaspiro[3.3]heptanes and subsequent conversions into functionalized derivatives are described. The methods reported are amenable