Enantio-, Diastereo-, and Regioselective Iridium-Catalyzed Asymmetric Allylic Alkylation of Acyclic β-Ketoesters
作者:Wen-Bo Liu、Corey M. Reeves、Brian M. Stoltz
DOI:10.1021/ja4097829
日期:2013.11.20
The first regio-, diastereo-, and enantioselective allylic alkylation of acyclic β-ketoesters to form vicinal tertiary and all-carbon quaternary stereocenters is reported. Critical to the successful development of this method was the employment of iridium catalysis in concert with N-aryl-phosphoramidite ligands. Broad functional group tolerance is observed at the keto-, ester-, and α-positions of the
Brooks,D.W. et al., Angewandte Chemie, 1979, vol. 91, p. 76 - 77
作者:Brooks,D.W. et al.
DOI:——
日期:——
Reductive Ti-crossed Claisen Condensation between Methyl α-Bromocarboxylates and Acid Chlorides Utilizing a TiCl<sub>4</sub>–PPh<sub>3</sub>–<i>N</i>-Methylimidazole Reagent
Reductive Ti-crossed Claisen condensation between methyl α-bromocarboxylates and acid chlorides utilizing a TiCl4–PPh3–N-methylimidazole reagent proceeded smoothly to give the α-monosubstituted and...
利用 TiCl4–PPh3–N-甲基咪唑试剂,α-溴代羧酸甲酯和酰氯之间的还原性 Ti 交叉克莱森缩合反应顺利进行,得到 α-单取代和...
(E)- and (Z)-stereodefined enol phosphonates derived from β-ketoesters: stereocomplementary synthesis of fully-substituted α,β-unsaturated esters
robust, and stereocomplementary synthesis of fully-substituted (E)- and (Z)-stereodefined α,β-unsaturated esters 3 from accessible α-substituted β-ketoesters 1via (E)- and (Z)-enol phosphonates was achieved. The present method involves two accessible reaction sequences: (i) (E)- and (Z)-stereocomplementary enol phosphorylations of a wide variety of β-ketoesters 1 (24 examples; 71–99% yield, each >95 : 5