The carbonyl group tuned electron-deficient phosphorus ligands and their application in Rhodium catalyzed arylation to aldehydes
摘要:
Acylphosphines, which could be efficiently prepared from acid chlorides and secondary phosphines, were developed as a type of carbonyl group tuned electron-deficient phosphorus ligand. They were found to be a kind of efficient ligand in Rhodium catalyzed arylation to aldehydes through accelerating the transmetalation process. Chiral acylphosphine ligands could be generated from carboxylic acids bearing the chiral framework correspondingly. (C) 2015 Elsevier Ltd. All rights reserved.
The asymmetric catalytic addition of alcohols (phenols) to non‐activated alkenes has been realized through the cycloisomerization of 2‐allylphenols to 2‐methyl‐2,3‐dihydrobenzofurans (2‐methylcoumarans). The reaction was catalyzed by a chiral titanium–carboxylate complex at uncommonly hightemperatures for asymmetric catalytic reactions. The catalyst was generated by mixing titanium isopropoxide, the
BULKY LIGANDS AND METAL COMPOUNDS COMPRISING BULKY LIGANDS
申请人:Marshak Michael Pesek
公开号:US20170121263A1
公开(公告)日:2017-05-04
This disclosure provides, molecular metal catalysts supported by sterically bulky β-diketonate (acac) ligands. Disclosed herein are bulky β-diketonate ligands, methods of making bulky β-diketonate ligands, and methods of making metal catalysts supported by sterically bulky β-diketonate (acac) ligands.
Nucleophilic Aromatic Substitution on 1-Alkoxy-2-naphthoates with 1-Naphthyl Grignard Reagents. A Practical and Convenient Asymmetric Synthesis of 1,1′-Binaphthyl-2-carboxylates
Grignard reagents efficiently displace the 1-alkoxyl group of 1-alkoxy-2-naphthoic esters to provide an easy access to the corresponding 1,1′-binaphthyl-2-carboxylates in excellent yields; isopropyl ester is bulky enough to prevent the Grignard addition to the ester carbonyl function. High levels of asymmetric induction (up to 98% optical yield) have been achieved in the joining of the two naphthalene rings