Efficient One-Step Aldol-Type Reaction of Ketones with Acetals and Ketals Mediated by Dibutylboron Triflate/Diisopropylethyl Amine
作者:Lian-Sheng Li、Sanjib Das、Subhash C. Sinha
DOI:10.1021/ol030108u
日期:2004.1.1
one-step Mukaiyama aldol-type reaction has been developed for the synthesis of beta-alkoxy carbonyl compounds starting from ketones and acetals/ketals. The reaction is mediated by a combination of Bu(2)BOTf and i-Pr(2)NEt affording the products in high yields. Formation of the two possible diastereoisomers of the beta-alkoxy ketones from the chiral acetals shows that the condensation takes place by an
单步的Mukaiyama aldol型反应[反应:参见正文]已经开发了一种高效的单步的Mukaiyama aldol型反应,用于从酮和缩醛/缩酮开始合成β-烷氧基羰基化合物。通过Bu(2)BOTf和i-Pr(2)NEt的组合来介导反应,从而以高收率提供产物。由手性缩醛形成的两种可能的β-烷氧基酮的非对映异构体表明,缩合反应是通过S(N)1机理发生的,包括先将缩醛打开为氧离子。