Chiral Bis oxazoline -Mg Catalysts

This was also illustrated by other groups. Desimoni et al. and Takacs et al. studied the factors affecting the stereocontrol of 39a-magnsium triflate catalyst more intensively, and concluded that the reactive intermediates are 

If both the radical source and the radical trap are in the same molecule, then an intramolecular atom-transfer radical cyclisation reaction occurs. In 2001, Yang et al. reported the oxazoline 39d-magnesium-catalysed bromine atom-transfer radical cyclisation reaction of unsaturated p-keto ester 49 for 

Lautens et al. presented a 39c-magnesium iodide promoted enantioselective ring expansion of methylene cyclopropane amides 65 to enantioenriched methylene pyrrolidines 67. The key step of this transformation is the ring opening of methylene cyclopropanes with magnesium iodide, generating a vinylogous enolate intermediate 68 that can react with imines 66. Under the optimised catalytic conditions, a variety of enantioenriched 

The Trost group has developed an efficient ProPhenol dinuclear zinc catalytic system, which is used in many reactions. Recendy, they expanded the 

The chiral Cz-symmetric Af,N -dioxides 89, developed by Feng s group, could serve as a tetradentate ligand, in which both ojg gens of the Af-oxide and both carbonyl o)g gen s coordinate to a metal centre, such as magnesium, and the 

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