Technical Notes:

1. Planar-chiral catalyst useful in a variety of enantioselective addition and cycloaddition reactions of ketenes.

2. For a review on nucleophilic catalysis using planar-chiral derivatives of DMAP, see Ref (4).

References:

1. Angew. Chem, Int. Ed.. 2007. 46, 977.

2. J. Am. Chem. Soc., 2014. 136, 8899.

3. Angew. Chem., Int. Ed.. 2008, 47, 7048.

4.Acc. Chem. Res., 2004, 37, 542.