Abstract
AbstractA series of chiral sterically congested phosphane‐amide bifunctional Lewis bases L1–L3 have been successfully synthesized and their application in asymmetric aza‐Morita–Baylis–Hillman (aza‐MBH) reactions of N‐sulfonated imines with activated olefins such as methyl and ethyl vinyl ketone has been investigated under mild conditions. The corresponding aza‐MBH adducts can be obtained in good‐to‐excellent yields (up to 98 %) and moderate‐to‐good enantioselectivities (up to 91 or 93 % ee) in dichloromethane at room temperature (20 °C) with these novel chiral bifunctional phosphane Lewis bases.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
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