The asymmetric epoxidation of alpha,beta-unsaturated aldehydes, catalyzed by a spiro-pyrrolidine (SPD)-derived organocatalyst, has been accomplished with good diastereoselectivities (up to dr >20:1) and with high to excellent enantioselectivities (up to 99% ee). (C) 2016 Elsevier Ltd. All rights reserved.
Stereocontrolled [m + n] annulation reactions. 2. A [3 + 3] route to chiral, nonracemic 1,2-cyclohexanediols