Highly Stereoselective 7-Endo-Trig/Ring Contraction Cascade To Construct Pyrrolo[1,2-a]quinoline Derivatives
摘要:
With the cooperation of Cram's phenonium ion, a novel cascade reaction was illustrated to construct pyrrolo[1,2-a]quinolines as a sole diastereoisomer in good to excellent yields. Preliminary mechanistic studies revealed that the gamma-lactam ring and electron-rich arene are important driving forces for ring contraction.
Palladium-Catalyzed Aerobic Intramolecular Aminoacetoxylation of Alkenes Enabled by Catalytic Nitrate
作者:Jiaming Li、Robert H. Grubbs、Brian M. Stoltz
DOI:10.1021/acs.orglett.6b02722
日期:2016.11.4
A mild aerobic intramolecular aminoacetoxylation method for the synthesis of pyrrolidine and indoline derivatives was achieved using molecular oxygen as the oxidant. A catalytic NOx species acts as an electron transfer mediator to access a high-valent palladium intermediate as the presumed active oxidant.
Access to Chiral Hydropyrimidines through Palladium-Catalyzed Asymmetric Allylic C−H Amination
作者:Pu-Sheng Wang、Meng-Lan Shen、Tian-Ci Wang、Hua-Chen Lin、Liu-Zhu Gong
DOI:10.1002/anie.201709681
日期:2017.12.11
A palladium‐catalyzed asymmetric intramolecular allylic C−H amination controlled by a chiral phosphoramidite ligand was established for the preparation of various substitutedchiral hydropyrimidinones, the precursors of hydropyrimidines, in high yields with high enantioselectivities. In particular, dienyl sodium N‐sulfonyl amides bearing an arylethene‐1‐sulfonyl group underwent a sequential allylic
Chiral ligands: Hg(OTf)2‐catalyzed cyclization of anilinosulfonamideallylalcohol is described; this reaction gives 2‐vinyl indoline derivatives in good yields and excellent enantioselectivity by using a chiral BINAPHANE ligand (see scheme).
bearing a phenylurea moiety was applied to enantioselective bromoaminocyclization reactions of 2-allylaniline derivatives, which provide opticallyactive 2-substituted indoline products as important motifs for biologically active compounds. A protecting group on the nitrogen of the 2-allylaniline substrate was carefully optimized, and highly enantioselective reactions were achieved by employing the
Highly Stereoselective <i>7-Endo-Trig</i>/Ring Contraction Cascade To Construct Pyrrolo[1,2-<i>a</i>]quinoline Derivatives
作者:Xinyu Li、Cheng Li、Wenjing Zhang、Xiang Lu、Shiqing Han、Ran Hong
DOI:10.1021/ol100220c
日期:2010.4.16
With the cooperation of Cram's phenonium ion, a novel cascade reaction was illustrated to construct pyrrolo[1,2-a]quinolines as a sole diastereoisomer in good to excellent yields. Preliminary mechanistic studies revealed that the gamma-lactam ring and electron-rich arene are important driving forces for ring contraction.