Cationic Palladium Complex-Catalyzed Diastereoselective Tandem Annulation of 2-Iminoarylboronic Acids with Substituted Alkynes: Enantioselective Synthesis of Aminoindene Derivatives by Double Asymmetric Induction
作者:Xufen Yu、Xiyan Lu
DOI:10.1002/adsc.201100363
日期:2011.10
2-iminoarylboronic acids and alkynes was developed for the synthesis of aminoindene derivativescatalyzed by cationic palladium complex. In addition, an enantioselective synthesis of aminoindene derivatives from the reaction of substituted (S)-2-(N-tert-butanesulfinylimino)arylboronicacids with a variety of alkynes catalyzed by chiral cationic palladium complex was also achieved by the double asymmetric induction
Gold(III)‐Catalyzed Intermolecular Oxidation‐Cyclization of Ynones: Access to 4‐Substituted Chroman‐3‐ones
作者:Jian Li、Fang Yang、Yang‐Ting Ma、Kegong Ji
DOI:10.1002/adsc.201900260
日期:2019.4.23
A synthesis of 4‐substituted chroman‐3‐one derivatives has been developed through a gold(III) catalyzed oxidation‐cyclization of ynones in good to excellent yield using easily prepared substrates. A broad range of synthetically useful functional groups (halide, alkene, alkyne, phenolic hydroxyl) were tolerated. Further application of this method paves a new way to prepare the skeleton of oblarotenoids
The asymmetric transfer hydrogenation of α,β‐propargyl ketones catalyzed by an in situ formed ruthenium–hydroxyamide complex was explored. The acetylenic alcohols were isolated in good to excellent yields with excellent ee values (typically >90 %) after short reaction times at room temperature.
A Boron–Oxygen Transborylation Strategy for a Catalytic Midland Reduction
作者:Kieran Nicholson、Joanne Dunne、Peter DaBell、Alexander Beaton Garcia、Andrew D. Bage、Jamie H. Docherty、Thomas A. Hunt、Thomas Langer、Stephen P. Thomas
DOI:10.1021/acscatal.0c05168
日期:2021.2.19
The enantioselective hydroboration of ketones is a textbook reaction requiring stoichiometric amounts of an enantioenriched borane, with the Midland reduction being a seminal example. Here, a turnover strategy for asymmetric catalysis, boron–oxygen transborylation, has been developed and used to transform the stoichiometric boranereagents of the Midland reduction into catalysts. This turnover strategy
Use of 1-chlorovinyl p-tolyl sulfoxides as alkynylmagnesium chloride sources
作者:Koto Sekiguchi、Tsutomu Kimura
DOI:10.1016/j.tet.2023.133439
日期:2023.6
A method for generating alkynylmagnesium chlorides from 1-chlorovinyl p-tolyl sulfoxides and an isopropylmagnesium chloride–lithium chloride complex (turbo Grignard reagent) has been developed. The method consists of a sulfoxide/magnesium exchange reaction of 1-chlorovinyl p-tolyl sulfoxides and a turbo Grignard reagent, a Fritsch–Buttenberg–Wiechell rearrangement of the resulting magnesium alkylidene