Strain‐Induced Nucleophilic Ring Opening of Donor–Acceptor Cyclopropenes for Synthesis of Monosubstituted Succinic Acid Derivatives
作者:Kostiantyn O. Marichev、Kan Wang、Nicole Greco、Kuiyong Dong、Jinzhou Chen、Jinping Lei、Michael P. Doyle
DOI:10.1002/chem.202003427
日期:2021.1.4
nucleophiles to form α‐substituted succinic acid derivatives in high yields. Initial dirhodium(II) carboxylate catalysis rapidly converts enoldiazo‐acetates or ‐acetamides to DACPs that undergo catalyst‐free Favorskii ring opening with amines, and also with anilines, alcohols, and thiols, when facilitated by catalytic amounts of 4‐dimethylaminopyridine (DMAP). This methodology provides easy access to mixed esters
由Enoldiazo化合物原位生成的1,2,3-三取代的供体-受体环丙烯(DACP)与亲核试剂反应,以高收率形成α-取代的琥珀酸衍生物。在催化量的4-二甲基氨基吡啶(DMAP)的促进下,最初的羧酸二氢吡啶鎓(II)催化作用迅速将烯丙氧基乙酸酯或乙酰胺转化为DACP,这些DACP与胺,苯胺,醇和硫醇进行无催化剂的Favorskii开环反应。 。这种方法可轻松获得单取代琥珀酸的混合酯和酰胺,包括天然化合物的衍生物。它还以高收率提供了二酰肼,二氢肟酸和二酰胺衍生物,以及α-取代的四氢哒嗪-3,6-二酮。用手性二铑催化剂形成的R和S构型非常相似,对映体控制的损失可能源自DACP环形成步骤,该步骤可通过其中间金属碳烯来逆转。