A mild and efficient approach to enantioenriched α-hydroxyethyl α,β-unsaturated δ-lactams
作者:Seo-Jung Han、Brian M. Stoltz
DOI:10.1016/j.tetlet.2016.04.022
日期:2016.5
N-tert-butylsulfinyl imine. The α,β-unsaturated δ-lactam was furnished by ring-closing metathesis. Although Baylis-Hillman chemistry failed on this cyclic compound, introduction of the hydroxyethyl group prior to ring-closing metathesis was successful. A Baylis-Hillman reaction was used to introduce the substituent at the α-position of the α,β-unsaturated lactam.
描述了一种对映体富集的α-取代的α,β-不饱和δ-内酰胺的直接方法。尽管已经报导了相当多的α,β-不饱和δ-内酰胺的制备方法,但是,对映体富集的α,δ-二取代的α,β-不饱和δ-内酰胺的例子相对较少。δ-立体中心是通过将烯丙基溴化镁加到N-叔丁基亚磺酰基亚胺形成的。α,β-不饱和δ-内酰胺通过闭环复分解得到。尽管Baylis-Hillman化学方法在该环状化合物上失败了,但是在闭环易位之前成功引入了羟乙基。使用Baylis-Hillman反应在α,β-不饱和内酰胺的α-位引入取代基。