Cu
<sup>II</sup>
‐Catalyzed Asymmetric Hydrosilylation of Diaryl‐ and Aryl Heteroaryl Ketones: Application in the Enantioselective Synthesis of Orphenadrine and Neobenodine
作者:Yao‐Zong Sui、Xi‐Chang Zhang、Jun‐Wen Wu、Shijun Li、Ji‐Ning Zhou、Min Li、Wenjun Fang、Albert S. C. Chan、Jing Wu
DOI:10.1002/chem.201200379
日期:2012.6.11
With certain amounts of sodium tert‐butoxide and tert‐butanol as additives, catalytic amounts of an inexpensive and easy‐to‐handle copper source Cu(OAc)2⋅H2O, a commercially available and air‐stable non‐racemic dipyridylphosphine ligand, as well as the stoichiometric desirable hydride donor polymethylhydrosiloxane (PMHS), formed a versatile in situ catalyst system for the enantioselective reduction
CuH-Catalyzed Asymmetric 1,6-Conjugate Reduction of <i>p</i>-Quinone Methides: Enantioselective Synthesis of Triarylmethanes and 1,1,2-Triarylethanes
作者:Ting Pan、Pan Shi、Bo Chen、Da-Gang Zhou、Ya-Li Zeng、Wen-Dao Chu、Long He、Quan-Zhong Liu、Chun-An Fan
DOI:10.1021/acs.orglett.9b02308
日期:2019.8.16
The first copperhydride (CuH)-catalyzed asymmetric 1,6-conjugate reduction of p-quinone methides is reported. This protocol provides a new method to access a variety of triarylmethanes and 1,1,2-triarylethanes in good yields with excellent enantioselectivities and broad functional group tolerance.
Silver-Catalyzed Allenylation and Enantioselective Propargylation Reactions of Ketones
作者:Benjamin L. Kohn、Naoko Ichiishi、Elizabeth R. Jarvo
DOI:10.1002/anie.201206971
日期:2013.4.15
lining: Certain silver complexes are capable of selective catalysis of either allenylation or asymmetric propargylationreactions of ketones. Ligand‐free conditions lead to allenyl alcohols as the major product, whereas ligation with Walphos‐8 gives enantioenriched homopropargyl alcohols. This method can be applied to reactions of prochiral diarylketones to provide optically enriched tertiary diaryl alcohols