Sulfoxide ligand metal catalyzed oxidation of olefins
申请人:The Board of Trustees of the University of Illinois
公开号:US10266503B1
公开(公告)日:2019-04-23
The enantioselective synthesis of isochroman motifs has been accomplished via Pd(II)-catalyzed allylic C—H oxidation from terminal olefin precursors. Critical to the success of this goal was the development and utilization of a novel chiral aryl sulfoxide-oxazoline (ArSOX) ligand. The allylic C—H oxidation reaction proceeds with the broadest scope and highest levels asymmetric induction reported to date (avg. 92% ee, 13 examples ≥90% ee). Additionally, C(sp3)-N fragment coupling reaction between abundant terminal olefins and N-triflyl protected aliphatic and aromatic amines via Pd(II)/sulfoxide (SOX) catalyzed intermolecular allylic C—H amination is disclosed. A range of 52 allylic amines are furnished in good yields (avg. 76%) and excellent regio- and stereoselectivity (avg. >20:1 linear:branched, >20:1 E:Z). For the first time, a variety of singly activated aromatic and aliphatic nitrogen nucleophiles, including ones with stereochemical elements, can be used in fragment coupling stiochiometries for intermolecular C—H amination reactions.
Enantioselective Allylic C−H Oxidation of Terminal Olefins to Isochromans by Palladium(II)/Chiral Sulfoxide Catalysis
作者:Stephen E. Ammann、Wei Liu、M. Christina White
DOI:10.1002/anie.201603576
日期:2016.8.8
The enantioselective synthesis of isochroman motifs has been accomplished by palladium(II)‐catalyzedallylicC−H oxidation from terminal olefin precursors. Critical to the success of this goal was the development and utilization of a novel chiral aryl sulfoxide‐oxazoline (ArSOX) ligand. The allylicC−H oxidation reaction proceeds with the broadest scope and highest levels of asymmetric induction reported
The photoinduced electron transfer (PET) promoted decarboxylative radical additions of carboxylic acids using N-acryloyl amino acid esters and peptides as radicalacceptors smoothly afforded the corresponding modified amino acids and peptides under mild reaction conditions. The radical additions of α-amino acids led to the formation of γ- and α-dipeptide, and peptides underwent peptide coupling via
functionalized acyclic chiral pyrroloamide compounds were synthesized by a simple and robust process involving the creation of a C-C bond between unprotected pyrroles and acyclic chiral acrylamides using Lewis acids. This alkylation reaction using Michael acceptors has been optimized, allowing us to obtain channel selective access to monoalkylated or dialkylated pyrroles, in good yields. Di- and tripeptide deriving