Abstract A spiro bisphosphine oxide (SpinPO) was found to be an efficient chiral Lewis base catalyst in asymmetric reductive aldol reaction of enones and aldehydes in the presence of trichlorosilane as the reductant, affording a variety of β-hydroxyketones in good yields with moderate to high levels of diastereo- and enantioselectivities.
Rasta Resin-PPh3-NBniPr2 and its Use in One-Pot Wittig Reaction Cascades
作者:Yan Teng、Jinni Lu、Patrick H. Toy
DOI:10.1002/asia.201100721
日期:2012.2.6
reagent has been prepared and used effectively in a variety of one‐pot Wittigreactions. The design of this reagent resolved a deficiency of a previously reported related material, and allowed it to perform more efficiently in such reactions. Furthermore, it was readily recyclable, and was also successfully applied in cascade processes involving one‐pot Wittigreactions followed by either a conjugate
Tandem One-Pot Wittig/Reductive Aldol Reactions in which the Waste from One Process Catalyzes a Subsequent Reaction
作者:Jinni Lu、Patrick H. Toy
DOI:10.1002/asia.201100296
日期:2011.9.5
Putting waste to work: Tandem one‐pot Wittig/reductive aldol reactions have been performed in which the byproduct of the Wittig reaction, Ph3PO, catalyzes the reductive aldol reaction. This methodology is versatile and allows for three different building blocks to be combined in a simple, one‐pot procedure.
An efficient method was developed for the enantioselective reductive aldolreaction of α,β-unsaturated ketones with aldehydes in the presence of a Lewis base catalyst; conjugate reduction using a tertiary amine and trichlorosilyl triflate, followed by an aldolreaction with BINAP dioxide (BINAPO) as an organocatalyst, gave the corresponding product in high yield with high stereoselectivity.
Tailored trisubstituted chiral Cp<sup>x</sup>Rh<sup>III</sup> catalysts for kinetic resolutions of phosphinic amides
作者:Y. Sun、N. Cramer
DOI:10.1039/c7sc05411d
日期:——
position of the Cp ring leads to substantially increased selectivities for rhodium(III)-catalyzed kinetic resolutions and allowed for s-factors of up to 50. Their superiority is demonstrated by kinetic resolutions of phosphinic amides providing access to compounds with stereogenicphosphorus(V) atoms. The unreacted acyclic phosphinic amide and the cyclized product are both obtained in good yields and
引入了三取代的手性Cp x配体家族。基于双取代的惰性手性Cp x配体支架,在Cp环的中心位置引入庞大的第三取代基会导致铑(III)催化的动力学拆分的选择性大大提高,并允许s因子高达50。次膦酰胺的动力学拆分证明了它们的优越性,次膦酸酯提供了获取具有立体性磷(V)原子的化合物的途径。未反应的无环次膦酰胺和环化产物均以良好的收率和对映选择性获得。配体合成利用了后期修饰并扩展了可及的配体Cp x 配体组合。