PPh<sub>3</sub>-Catalyzed (3 + 3) Annulations of 5-Acetoxypenta-2,3-dienoate with 1C,3O-Bisnucleophiles: Facile Entry to Stable Monocyclic 2<i>H</i>-Pyrans
作者:Jian Hu、Wei Dong、Xin-Yan Wu、Xiaofeng Tong
DOI:10.1021/ol302634p
日期:2012.11.2
Phosphine-catalyzed (3 + 2) and (3 + 3) annulations between 5-acetoxypenta-2,3-dienoate and 1C,3O-bisnucleophiles are presented. The former cases can be achieved with the assistance of base while the latter is dominant without any additive. A series of deuterium-labeling experiments disclosed that the divergence in annulations is likely determined by the involved proton transfer processes.
Lewis base-catalyzed divergent isomerizations of 5-hydroxyl-2,3-dienoate
作者:Wei Dong、Pengfei Hu、Jian Hu、Xiaofeng Tong
DOI:10.1016/j.tetlet.2013.10.059
日期:2014.3
A divergent isomerization of 5-hydroxyl-2,3-dienoate 1 catalyzed by Lewis base has been developed, the phosphine catalyst leads to 5-oxohex-2(3)-enoates 2 while DABCO catalyst affords 3-ethoxy α,β-unsaturated lactone 3.