Exploring the Steric and Electronic Factors Governing the Regio- and Enantioselectivity of the Pd-Catalyzed Decarboxylative Generation and Allylation of 2-Azaallyl Anions
作者:Shuaifei Wang、Xiaoyan Qian、Yuanyu Chang、Jiayue Sun、Xiujing Xing、Wendy F. Ballard、Jason J. Chruma
DOI:10.1021/acs.joc.8b00491
日期:2018.4.6
The impact of the steric and electronic factors in both the para-substituted benzaldimine and 2,2-diarylglycine components on the regioselectivity and enantioselectivity of the palladium-catalyzed decarboxylative allylation of allyl 2,2-diarylglycinate aryl imines was explored. These studies revealed that using 2,2-di(2-methoxyphenyl)glycine as the amino acid linchpin allowed for the exclusive synthesis
立体和电子因素对参数的影响探索了取代的苯甲二胺和2,2-二芳基甘氨酸组分对钯催化的2,2-二芳基甘氨酸烯丙基烯丙基芳基亚胺的钯催化的脱羧烯丙基化的区域选择性和对映体选择性。这些研究表明,使用2,2-二(2-甲氧基苯基)甘氨酸作为氨基酸发夹可以独立于亚胺部分的性质以期望的高收率独家合成所需的均烯丙基二苯甲酮亚胺区域异构体。然而,与涉及相应的2,2-二苯基甘氨酸烯丙基烯丙基亚胺的转化相比,所得的对映体比率略有降低,但这在产率和区域选择性的增加上得到了平衡。总的来说,这些研究提出了2-氮杂烯丙基阴离子的高度区域选择性功能化的一般策略。