Highly Stereoselective Titanium-Mediated Aldol Reaction from (<i>S</i>)-4-Benzyloxy-3-methyl-2-butanone
作者:Joana Zambrana、Pedro Romea、Fèlix Urpí、Cristina Luján
DOI:10.1021/jo201021z
日期:2011.11.4
Substrate-controlled titanium-mediated aldol reactions from (S)-4-benzyloxy-3-methyl-2-butanone provide satisfactory levels of 2,5-syn asymmetric induction if they are carried out in the presence of a second equivalent of TiCl4. Such reactions give high yields and excellent diastereoselectivity with a wide array of achiral and chiral aldehydes without needing other sources of chirality. This procedure
(S)-4-苄氧基-3-甲基-2-丁酮的受基质控制的钛介导的羟醛反应,如果在第二当量的TiCl 4存在下进行,则可提供令人满意的2,5-顺式不对称诱导。。这样的反应在不需要其他手性来源的情况下,具有广泛的非手性和手性醛,可提供高收率和出色的非对映选择性。因此,该方法对于天然产物的合成是令人感兴趣的。此外,反应物种的光谱学研究和分析揭示了解释实验结果的可能机制。