Silanediols: A New Class of Hydrogen Bond Donor Catalysts
作者:Andrew G. Schafer、Joshua M. Wieting、Anita E. Mattson
DOI:10.1021/ol2021115
日期:2011.10.7
Silanediols are introduced as a new class of hydrogenbond donor catalysts for the activation of nitroalkenes toward nucleophilic attack. Excellent yields of product are obtained for the conjugate addition of indole to β-nitrostyrene catalyzed with a stable, storable dinaphthyl-derived silanediol. The preparation and structural characterization of a C2-symmetric chiral silanediol is also reported along
Stable and isolable silanols with various aromatic substituents (e. g., naphthyl or phentanthrenyl) were obtained by hydrolysis of alkoxy- and chlorosilanes. The resulting compounds exhibit strong hydrogen bonds both in solution and in the solid-state. Single-crystal X-ray structures showed π-π interactions dominating the structures of the non-hydrolyzed precursor molecules. The resulting crystalline