Abstract
The Diels-Alder reaction is a widely employed protocol in which four stereogenic centers are generated in a predictable manner with olefin geometry, adjoining chiral center, and transition-state topology serving as the main controlling elements. However, when the Diels-Alder partners are in a dissymmetric environment, pi-face selection is determined through the interplay of steric, orbital, and electrostatic factors whose relative importance is a subject of intense debate. Several new systems have been crafted to probe the mechanistic nuances of the pi-face selection. The available data have enabled us to qualitatively define a hierarchy of various stereoelectronic effects that would aid predictability of the stereochemical outcome.
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