Unusually High Reactivity of the C-Si Bond in the Lewis Acid Mediated Reactions of (E)-1-(Trimethylsilyl)-2-(isopropylthio)ethylene with Carbonyl Electrophiles
Highly Diastereoselective Crown Ether Catalyzed Arylogous Michael Reaction of 3-Aryl Phthalides
作者:Marina Sicignano、Antonella Dentoni Litta、Rosaria Schettini、Francesco De Riccardis、Giovanni Pierri、Consiglia Tedesco、Irene Izzo、Giorgio Della Sala
DOI:10.1021/acs.orglett.7b02113
日期:2017.8.18
The first arylogous Michael reaction of 3-aryl phthalides has been developed. The reaction, promoted by catalytic amounts of KOH or K3PO4 and dibenzo-18-crown-6, affords the corresponding 3,3-disubstituted phthalides in good to high yields and as single diastereomers in nearly all studied cases.
已经开发了第一个3-芳基邻苯二甲酸酯的迈克尔反应。由催化量的KOH或K 3 PO 4和二苯并18-冠-6促进的反应,以几乎所有的研究情况,均以高收率和高收率提供了相应的3,3-二取代邻苯二甲酸酯。
Multinuclear Cu-Catalysts Based on SPINOL-PHOS in Asymmetric Conjugate Addition of Organozinc Reagents
Multinuclear Cu/Zn complex-catalyzed efficient asymmetric conjugateaddition of organozincreagents to acyclic and cyclic enones has been developed in the presence of a wide variety of regioisomeric chiral diols bearing phosphorus moieties as ligands. The regioisomeric SPINOL-PHOS ligands based on a SPINOL architecture showed an unexpected inversion of stereoselectivity.
Multinuclear Catalyst for Copper-Catalyzed Asymmetric Conjugate Addition of Organozinc Reagents
作者:Kohei Endo、Mika Ogawa、Takanori Shibata
DOI:10.1002/anie.200906839
日期:2010.3.22
A whole lot o' metal: An efficient copper‐catalyzed asymmetric conjugate addition was achieved using a binol‐derived ligand. The catalytic system has a turnover number of 2000, and the excellent catalytic performance could be attributed to the generation of a multinuclear complex such as 1. binol=2,2′‐dihydroxy‐1,1′‐binaphthyl.
Stereoselective synthesis of either (E)- or (Z)-silyl enol ether from the same acyclic α,β-unsaturated ketone using cationic rhodium complex-catalyzed 1,4-hydrosilylation
The stereoselective synthesis of either (E)- or (Z)-silyl enolether from the same acyclic α,β-unsaturated ketone is reported. Highly (Z)-selective conditions were the use of [Rh(cod)2]BF4/DPPE at roomtemperature with no solvent, whereas (E)-selective conditions were the use of [Rh(cod)2]BF4/P(1-Nap)3 (1-Nap = 1-naphthyl) under refluxing dichloromethane.
for the conversion of α,β-unsaturated carbonyls to multi-substituted benzenes using allylicphosphoniumylide reagents has been developed. The substituents and their positions on the benzene ring are controllable and predictable by the choice of an appropriate combination of α,β-unsaturated carbonyl compounds and ylides.