2-position, gave a synergistic effect leading to two powerful complementary organocatalysts. They show excellent enantiocontrol in the -functionalization of a wide range of linear/branched aldehydes and ketones, including Michael additions to ethenediyl disulfones or nitrostyrene and -amination. We obtained ees up to 98.5 % with low catalyst loadings (down to 1 mol-%). As a proof of efficiency, TOFs of up to
Organocatalytic Addition on 1,2-Bis(sulfone)vinylenes Leading to an Unprecedented Rearrangement
作者:Adrien Quintard、Alexandre Alexakis
DOI:10.1002/chem.200901535
日期:2009.10.26
An unprecedentedrearrangement of 1,2‐bis(sulfone)vinylenes used in aminocatalysis led to the formation of highly useful gem‐disulfones (see scheme). By using aminal–pyrrolidine organocatalysts, the 1,2‐sulfone shift was generalised, leading to highly versatile adducts using both ketones and aldehydes. It represents a valuable alternative for the α‐alkylation of carbonyl compounds.