The Important Role of the Byproduct Triphenylphosphine Oxide in the Magnesium(II)-Catalyzed Enantioselective Reaction of Hemiacetals and Phosphorus Ylides
作者:Linqing Wang、Dongxu Yang、Dan Li、Xihong Liu、Pengxin Wang、Kezhou Wang、Haiyong Zhu、Lutao Bai、Rui Wang
DOI:10.1002/anie.201804177
日期:2018.7.16
By employing a simple in situ generated magnesium catalyst, a direct asymmetric reaction between hemiacetals and phosphorusylides was achieved through a tandem Wittig–oxa‐Michael reaction sequence. Enantioenriched chromans, isochromans, and tetrahydropyrans were obtained in good chemical yields, and (−)‐erythrococcamide B was synthesized in enantioenriched form. The byproduct triphenylphosphine oxide