A one-pot process for the enantioselective synthesis of tetrahydroquinolines and tetrahydroisoquinolines <i>via</i> asymmetric reductive amination (ARA)
作者:Tao Yang、Qin Yin、Guoxian Gu、Xumu Zhang
DOI:10.1039/c8cc03586e
日期:——
Asymmetric reductiveamination for the synthesis of both chiral tetrahydroquinolines (THQs) and tetrahydroisoquinolines (THIQs) has been realized with an Ir/ZhaoPhos catalytic system via a one-pot N-Boc deprotection/intramolecular asymmetric reductiveamination (ARA) sequence. Control experiments reveal that HCl plays a vital role to the success of this transformation. The HCl acid assists the removal
Ir / ZhaoPhos催化体系通过一锅N - Boc脱保护/分子内不对称还原胺化(ARA)序列实现了用于合成手性四氢喹啉(THQs)和四氢异喹啉(THIQs)的不对称还原胺化。对照实验表明,HCl对这种转化的成功起着至关重要的作用。HCl酸有助于除去N- Boc保护基,还提供氯离子与ZhaoPhos中的硫脲部分相互作用,从而实现出色的反应对映控制。
Enantioselective cooperative triple catalysis: unique roles of Au(<scp>i</scp>)/amine/chiral Brønsted acid catalysts in the addition/cycloisomerization/transfer hydrogenation cascade
作者:Nitin T. Patil、Vivek S. Raut、Ramesh Babu Tella
DOI:10.1039/c2cc37623g
日期:——
An enantioselective cooperative process involving the concerted/simultaneous action of three different catalysts i.e. Au(I)/amine/chiral Bronsted acid catalysts has been realized for the synthesis of 2-substituted tetrahydroquinolines from 2-aminobenzaldehydes and terminal alkynes.