Abstract
Simple diastereoselectivity of several important categories of aldol reactions of persubstituted enolates has been investigated for sterically least biased cyclic and acyclic ketone and aldehyde enolates, and has been found to be useful for the stereoselective construction of quaternary carbon centers. The types of reactions examined involve the reaction of lithium, borinate, borate, trialkoxytitanium, trichlorotitanium, and zirconium (Cp 2 ZrCl) enolates, and the reactions of enol silyl ethers under high pressure, fluoride catalysis, and Lewis acid catalysis. In contrast to the less substituted metal enolates, uncatalyzed reactions of persubstituted metal enolates proceeded in a sense anticipated from the conventional Zimmerman-Traxler chair transition state (TS) model
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