Enantioselective Synthesis of Planar Chiral Pyridoferrocenes via Palladium-Catalyzed Imidoylative Cyclization Reactions
作者:Shuang Luo、Zhuang Xiong、Yongzhi Lu、Qiang Zhu
DOI:10.1021/acs.orglett.8b00348
日期:2018.4.6
A highly efficient synthesis of planar chiral pyrido[3,4-b] ferrocenes by a palladium-catalyzed enantioselective isocyanide insertion/desymmetric C(sp2)–H bond activation reaction was developed. Various planar chiral pyridoferrocenes were obtained in high yields with good to excellent enantioselectivity under mild conditions (up to 99% yield, 99% ee), enabled by a unique SPINOL-derived phosphoramidite
通过钯催化的对映选择性异氰酸酯插入/不对称的C(SP 2)-H键活化反应,开发了一种高效的平面手性吡啶并[3,4- b ]二茂铁的合成方法。得益于独特的SPINOL衍生的亚磷酰胺配体,可以在温和的条件下(高至99%收率,99%ee),以高收率获得各种平面手性吡啶二茂铁,对映选择性很好。
Copper(I)-Catalyzed Enantioselective Substitution of Allyl Chlorides with Diorganozinc Compounds
Ferrocenylamines are excellent catalysts for the enantioselective substitution of unsymmetrical allyl chlorides with dialkylzinc compounds in the presence of a copper(I) salt. For example, in the reaction shown in Equation (1), the product is formed with 87 % ee and a SN 2':SN 2 ratio of 97:3.