Tandem conjugate addition-aldol reaction to α,β-unsaturated esters and ketones using titanium amide
作者:Akira Hosomi、Toshiharu Yanagi、Makoto Hojo
DOI:10.1016/s0040-4039(00)79926-6
日期:1991.5
Titanium dialkylamide, readily available, adds to a α,β-unsaturated esters and ketones in a conjugate addition mode to give ester and ketone enolates, respectively, which are successively quenched with electrophiles such as aldehydes and acetals. The aldol products can be readily converted to the corresponding deaminated or dehydrated derivatives selectively.
容易获得的二烷基酰胺钛以共轭加成方式加到α,β-不饱和酯和酮上,分别得到酯和酮烯酸酯,然后用亲电子试剂如醛和缩醛将其连续淬灭。羟醛产物可以容易地选择性地转化为相应的脱氨基或脱水衍生物。