Asymmetric Hetero-Diels–Alder Reaction of Diazenes Catalyzed by Chiral Silver Phosphate: Water Participates in the Catalysis and Stereocontrol
作者:Bin Liu、Tong-Yu Liu、Shi-Wei Luo、Liu-Zhu Gong
DOI:10.1021/ol503047s
日期:2014.12.5
The chiral silver phosphate was confirmed to efficiently catalyze a highly regio- and enantioselective hetero-Diels–Alder reaction of diazenes to furnish piperazine derivatives in high yields and excellent ee values. DFT calculations revealed that the water molecule participates in the catalysis by coordination to silver phosphate and also found that the hydroxy group of 1-hydroxy-2,3-hexadiene not
确认手性磷酸银可有效催化二氮烯的高度区域和对映选择性杂-Diels-Alder反应,从而以高收率和优异的ee值提供哌嗪衍生物。DFT计算表明,水分子通过与磷酸银配位而参与催化,并且还发现1-羟基-2,3-己二烯的羟基不仅与磷酸盐的氧形成氢键,而且与Ag配位。 (I)同时稳定过渡态并控制区域选择性。