Abstract
Abstract Asymmetric Diels-Alder reactions of cyclopentadiene with methacrolein and 2-bromoacrolein catalyzed by chiral oxazaborolidines 1 derived from N-tosyl-L-α-amino acids afforded cycloadducts in quantitative yield. Variation in the position of an electron donor atom in the α-side chain substituent shows that enantioselectivity is controlled by the presence of electron donor atoms in position 2 and 4.
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