Abstract
AbstractMetal‐free bisoxazolines catalyze the Diels–Alder reaction of N‐substituted maleimides with anthrone derivatives leading to products in excellent yields and enantioselectivities up to 70 %. A mechanism relying on Brønsted‐base catalysis is assumed to be involved with formation of an ion pair between the protonated catalyst and the anthrone enolate, which acts as a diene.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
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