Design and Synthesis of Polymeric Chiral Bicyclo[3.3.0] Diene as Reusable Ligand for Rhodium-Catalyzed Asymmetric 1,4-Addition
作者:Hongyu Yang、Minghua Xu
DOI:10.1002/cjoc.201201079
日期:2013.1
A series of A‐B type sterically regular bicyclio[3.3.0] diene‐based polymers were designed and synthesized as immobilized chiraldieneligands for asymmetric catalysis. With polymericdiene 6b, good to excellent enantioselectivities can be achieved in Rh‐catalyzed asymmetric 1,4‐addition of arylboronic acids to α,β‐unsaturated ketones.
Application of chiral N-tert-butylsulfinyl vinyl aziridines in Rh(i) catalyzed 1,4-addition of aryl boronic acids to cyclic enones
作者:Qian Chen、Chao Chen、Fang Guo、Wujiong Xia
DOI:10.1039/c3cc42673d
日期:——
Chiral N-tert-butylsulfinyl vinyl aziridine ligands prepared from a readily available (R)-tert-butanesulfinamide have been applied in the rhodium-catalyzedasymmetric1,4-addition of arylboronicacids to cyclic enones, which gives high yields and excellent enantioselectivities.
Asymmetric cyclization of 4-aryl-4-pentenals by using a cationic [Rh((R)-BINAP)]ClO4 afforded (3R)-3-substituted cyclopentanones; on the other hand, the cyclization of 4-pentenals bearing ortho-halogeno phenyl groups afforded the opposite (3S)-ones.
Design of Chiral Sulfoxide–Olefins as a New Class of Sulfur-Based Olefin Ligands for Asymmetric Catalysis
作者:Wei-Yi Qi、Ting-Shun Zhu、Ming-Hua Xu
DOI:10.1021/ol201151r
日期:2011.7.1
The design and development of a novel class of chiral sulfur–olefin hybrid ligands with high synthetic feasibility are described. These new sulfoxide–olefin ligands showed excellent catalytic activities and enantioselectivities (up to 98% ee) in rhodium-catalyzed asymmetric 1,4-addition reactions of aryl boronic acids to α,β-unsaturated carbonyl compounds.
Stereoselective Synthesis of Aryl Cyclopentene Scaffolds by Heck-Matsuda Desymmetrization of 3-Cyclopentenol
作者:Ricardo A. Angnes、Juliana M. Oliveira、Caio C. Oliveira、Nelson C. Martins、Carlos Roque D. Correia
DOI:10.1002/chem.201404159
日期:2014.10.6
enantioselective Heck–Matsudadesymmetrization reaction was accomplished by using 3‐cyclopentenol to produce chiral five‐membered 4‐aryl cyclopentenol scaffolds in good yields and high ee’s, together with some 3‐aryl‐cyclopentanones as minor products. Mechanistically, the hydroxyl group of 3‐cyclopentenol acts as a directing group and is responsible for the cis‐ arrangement in the formation of the 4‐aryl‐cyclopentenols