Abstract
We developed the first chiral proline amide-isothiouronium based bifunctional organocatalyst, it was prepared by methylation of the corresponding thiourea. This asymmetric catalyst provides aldol products in high to quantitative yields while achieving excellent control performance of diastereoselectivities (anti/syn, up to 95:5 dr) and enantioselectivity (up to 99% ee) in the aldol reaction of various benzaldehydes with a cyclohexanone in water and formic acid.
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