Carbene insertion into acyl C-H bonds: Rh(III)-catalyzed cross-coupling of 2-aminobenzaldehydes with conjugated enynones
作者:Yifan Ping、Taiwei Chang、Jianbo Wang
DOI:10.1016/j.tet.2021.132274
日期:2021.7
A rhodium-catalyzed directed acyl C-H bonds carbeneinsertion reaction of 2-aminobenzaldehydes with conjugated enynones has been realized, affording a series of α-furyl ketone derivatives in moderate to good yields with good functional group tolerance. Carbene migratory insertion is proposed as the key step in this transformation.
Lewis Acid Catalyzed Intramolecular [4+2] Cycloaddition of In Situ Generated Aza‐Quinone Methides for the Stereoselective Synthesis of Furo/pyrano[3,2‐
<i>c</i>
]tetrahydroquinolines
作者:Santosh J. Gharpure、Dharmendra S. Vishwakarma
DOI:10.1002/ejoc.201901598
日期:2020.11.30
A TMSOTf‐catalyzed intramolecular [4+2] cycloaddition of in situ generated aza‐o‐quinone methide acts as an expedient, stereoselective access to cis/trans‐fused furo‐/pyrano[3,2‐c]tetrahydroquinolines with excellent yields and diastereoselectivity.
TMSOTf催化的原位生成的氮杂-邻-醌甲基化物的分子内[4 + 2]环加成反应,是对顺式/反式融合的呋喃-/吡喃并[3,2- c ]四氢喹啉的便捷,立体选择途径,并具有优异的收率和非对映选择性。
Diastereoselective Synthesis of Tetrahydroquinolines via [4 + 2] Annulation between in Situ Generated <i>p</i>-Quinone Methides and Nitroalkenes
作者:Junwei Wang、Xiang Pan、Jian Liu、Lin Zhao、Ying Zhi、Kun Zhao、Lihong Hu
DOI:10.1021/acs.orglett.8b02127
日期:2018.10.5
A formal [4 + 2] annulation reaction between in situ generated p-quinone methides and nitroalkenes via an aza-Michael/1,6-conjugate addition reaction sequence has been developed in which manganese dioxide is used as the oxidant to promote in situ formation of o-tosylaminophenyl-substituted p-QMs. Undermildconditions, this unprecedented cascade reaction readily occurs in good yield, providing straightforward
A copper(II)-catalyzed, sequential Michael–aldol reaction for the preparation of 1,2-dihydroquinolines
作者:Anna M. Wagner、Claire E. Knezevic、Jessica L. Wall、Victoria L. Sun、Joshua A. Buss、LeeAnn T. Allen、Anna G. Wenzel
DOI:10.1016/j.tetlet.2011.12.017
日期:2012.2
A copper(II)-catalyzed, sequential Michael addition-aldol condensation reaction of N-carboxybenzyl-protected aminobenzaldehyde with various α,β-unsaturated N-acyl pyrroles is described. Substrate scope was found to include both aryl and aliphatic N-acyl pyrroles as the Michael acceptors, and isolated product yields as high as 93% were observed. The use of acetonitrile as the reaction solvent proved