A Synthetic Route to Chiral Benzo-Fused N-Heterocycles via Sequential Intramolecular Hydroamination and Asymmetric Hydrogenation of Anilino-Alkynes
作者:Cong Xu、Yu Feng、Faju Li、Jiahong Han、Yan-Mei He、Qing-Hua Fan
DOI:10.1021/acs.organomet.9b00183
日期:2019.10.28
derivatives, were obtained from anilino-alkynes in high yields (up to 98%) with moderate to excellent enantioselectivities (up to 98% ee) under mild conditions. This protocol features good functional group tolerance and highatomeconomy. Furthermore, this catalytic protocol is applicable to gram-scale synthesis of a naturally occurring alkaloid, (−)-Angustureine.
已经报道了在单一手性钌配合物或由非手性金配合物和手性钌配合物组成的二元体系的催化下有效的顺序分子内加氢/不对称氢化反应。从苯胺衍生物获得了多种对映体富集的苯并稠合的N-杂环,包括1,2,3,4-四氢喹啉,二氢吲哚和2,3,4,5-四氢-1 H-苯并[ b ] pine庚因衍生物-炔烃在温和条件下具有高产率(高达98%)和中等至优异的对映选择性(高达98%ee)。该协议具有良好的官能团耐受性和较高的原子经济性。此外,该催化方案适用于天然存在的生物碱(-)-Angustureine的克规模合成。
Oxidative Rearrangement of Primary Amines Using PhI(OAc)<sub>2</sub> and Cs<sub>2</sub>CO<sub>3</sub>
herein reported. The combination of PhI(OAc)2 and Cs2CO3 proves highly efficient at inducing the direct 1,2-C to N migration of primary amines, which can be applied to the preparation of both acyclic and cyclic amines. A mechanistic study shows that the rearrangement proceeds via a concerted mechanism.
本文报道了由高价碘(III)试剂介导的伯胺的氧化重排。证明PhI(OAc)2和Cs 2 CO 3的组合在诱导伯胺从1,2-C向N的直接迁移方面非常有效,可用于制备无环胺和环胺。机理研究表明,重排通过协同机制进行。
Palladium-assisted N-alkylation of indoles: attempted application to polycyclization
作者:Louis S. Hegedus、Peter M. Winton、Sudarsanan Varaprath
DOI:10.1021/jo00324a004
日期:1981.5
Regioselectivity in forming dipole-stabilized anions. Sites of metalation of indolines, tetrahydroquinolines, and benzazepines activated by N-formimidoyl or N-Boc groups
作者:A. I. Meyers、Guy Milot
DOI:10.1021/jo00076a003
日期:1993.11
Metalation of the title compounds indicated that the formamidine-equipped indolines or 1,2,3,4-tetrahydroquinolines give rise solely to C-2 alkylation products (5,6) whereas the corresponding N-t-Boc systems give only ortho aryl alkylation (7, 8).
HEGEDUS L. S.; WINTON P. M.; VARAPRATH S., J. ORG. CHEM., 1981, 46, NO 11, 2215-2221