Highly Stereoselective Aldol Reaction Based on Titanium Enolates from (<i>S</i>)-1-Benzyloxy-2-methyl-3-pentanone
作者:Joan G. Solsona、Joaquim Nebot、Pedro Romea、Fèlix Urpí
DOI:10.1021/jo050792l
日期:2005.8.1
Alternative titanium-mediated aldol procedures based on several protected β-hydroxy ethyl ketones have been surveyed. Eventually, enolization of (S)-1-benzyloxy-2-methyl-3-pentanone (1) with (i-PrO)TiCl3/i-Pr2NEt provided a very reactive enolate that afforded the corresponding 2,4-syn-4,5-syn aldol adducts in high yields and diastereomeric ratios with a broad range of aldehydes
已经研究了基于几种受保护的β-羟乙基酮的钛介导的羟醛替代方法。最终,用(i -PrO)TiCl 3 / i -Pr 2 NEt对(S)-1-苄氧基-2-甲基-3-戊酮(1)进行烯化反应,提供了一个非常活泼的烯醇化物,提供了相应的2,4-顺-4,5-顺式羟醛加合物,具有高收率和非对映异构体比例,且具有广泛的醛类