ability of maleate half-ester salts to serve as electrophilic partners in 1,4-conjugate addition reactions with control of regioselectivity has previously been explored in only a limited context with soft nucleophiles. We have demonstrated that benzylic anions of picolines, as well as enolates of ketones, esters, and nitriles, react with lithium 4-(tert-butoxy)-4-oxobutenoate in a completely regioselective
马来酸半酯盐在 1,4-共轭加成反应中作为亲电伙伴的能力,并控制区域选择性,此前仅在有限的软亲核试剂背景下进行了探索。我们已经证明,
甲基吡啶的苄基阴离子以及酮、酯和腈的烯醇化物以完全区域选择性的方式与 4-(叔丁氧基)-4-氧代
丁烯酸
锂反应。这种新方法应用于制备临床候选药物 MK-8666 的关键氮杂
茚酮中间体的方便的两步法。