Tandem Blaise/retro-Blaise Reaction for the Nitrile-Mediated Regioselective Intermolecular Addition of Unstabilized Zinc Ester Enolates (Reformatsky Reagents) to 1-Alkynes and 1,3-Enynes
作者:Ju Hyun Kim、Yu Sung Chun、Sang-gi Lee
DOI:10.1021/jo402015n
日期:2013.11.15
of a nitrile as a mediator to achieve the regioselective intermolecular addition of unstabilized zinc ester enolates (Reformatsky reagents) to 1-alkynes and 1,3-enynes. This reaction is made possible by a reversible addition of enolates to a nitrile (Blaise reaction), generating a zinc aza-enolate that, unlike zinc ester enolates, can add intermolecularly to 1-alkynes and 1,3-enynes. Subsequent removal
我们报道了一种新型的腈作为介体的新用途,以实现对不稳定的区域选择性分子间加成的不稳定的锌酯烯酸酯(Reformatsky试剂)到1-炔烃和1,3-烯炔烃。通过将烯酸酯可逆地添加到腈中(布莱斯反应),可以生成该反应,生成氮杂-烯醇锌,与酯烯酸酯锌不同,可以将分子间添加到1-炔烃和1,3-烯炔中。随后通过逆Blaise反应除去腈可生成目标加成产物。该方法与Diels-Alder反应和随后的氧化芳构化相结合,可从Reformatsky试剂串联一锅从头开始构建α-芳基链烷酸酯。