Iron-Catalyzed Asymmetric Haloazidation of α,β-Unsaturated Ketones: Construction of Organic Azides with Two Vicinal Stereocenters
作者:Pengfei Zhou、Lili Lin、Long Chen、Xia Zhong、Xiaohua Liu、Xiaoming Feng
DOI:10.1021/jacs.7b06029
日期:2017.9.27
bromoazidation of α,β-unsaturated ketones catalyzed by chiral N,N'-dioxide/Fe(OTf)2 complexes. An array of aryl, heteroaryl, and alkyl substituted α,β-unsaturated ketones were transformed to the corresponding α-bromo-β-azido ketones in high yields with excellent diastereo- and enantioselectivities. The catalytic system was also applicable for chloroazidation and iodoazidation of chalcone. Kinetic studies and some
有机叠氮化物在合成化学、化学生物学、药物发现和材料科学中发挥着重要作用。烯烃的叠氮官能化是将叠氮基团快速引入有机化合物的最有效方法之一。但是在烯烃叠氮化的催化不对称版本中只记录了几个例子。在此,我们报告了由手性 N,N'-二氧化物/Fe(OTf)2 配合物催化的 α,β-不饱和酮的前所未有的高度非对映选择性和对映选择性溴叠氮化反应。一系列芳基、杂芳基和烷基取代的 α,β-不饱和酮以高产率转化为相应的 α-溴-β-叠氮酮,并具有优异的非对映选择性和对映选择性。该催化体系也适用于查耳酮的氯叠氮化和碘叠氮化。