Catalytic Enantioselective Quick Route to Aldol-Tethered 1,6- and 1,7-Enynes from ω-Unsaturated Aldehydes
作者:Jesús M. García、José M. Odriozola、Jesús Razkin、Irati Lapuerta、Amaiur Odriozola、Iñaki Urruzuno、Silvia Vera、Mikel Oiarbide、Claudio Palomo
DOI:10.1002/chem.201404452
日期:2014.11.17
developed based on a direct cross‐aldol reaction between ω‐unsaturated aldehydes and propargylic aldehydes (α,β‐ynals) promoted by combined α,α‐dialkylprolinol ether/Brønsted acid catalysis. This synergistic activation strategy is key to accessing the corresponding aldol adducts with high stereoselectivity, both enantio‐ and diastereoselectivity. The aldol reaction also proceeds well with propargylic ketones
基于结合α,α-二烷基脯氨醇促进的ω-不饱和醛与炔醛(α,β-醛基)之间的直接交叉羟醛反应,已开发出一种有效的不对称官能化1,6-和1,7-炔烃的路线。醚/布朗斯台德酸催化。这种协同活化策略是获得对映体和非对映体选择性高的立体选择性高的相应羟醛加合物的关键。醛醇缩合反应还可与炔丙基酮(α,β-炔酮)进行得很好,从而可以立体控制途径获得相应的叔醇。这些加合物的实用性很难通过标准方法进行制备,通过使用标准Pauson-Khand条件将其转化为三取代双环烯酮得以证明。