A set of six solid-supported diarylprolinol catalysts (varying on the anchoring strategy and the type of polymeric support) has been prepared and applied to the enantioselective cyclopropanation reaction. The selected candidate allows implementation of a long flow experiment (48 h) and generates a library of 12 cyclopropanes by sequential flow experiments. The mildness and utility of the method have enabled a telescoped process in which the outstream is directly used in a Wittig flow reaction.
Organocatalytic Enantioselective Continuous-Flow Cyclopropanation
Org. Lett. 2016, 18 (24), 6292-6295, DOI: 10.1021/acs.orglett.6b03156.