Catalytic Enantioselective Conjugate Alkynylation of β-Aryl-β-trifluoromethyl Enones Constructing Propargylic All-Carbon Quaternary Stereogenic Centers
作者:Amparo Sanz-Marco、Gonzalo Blay、Carlos Vila、José R. Pedro
DOI:10.1021/acs.orglett.6b01494
日期:2016.8.5
The enantioselective conjugate alkynylation of β-aryl-β-trifluoromethyl enones has been carried out using terminal alkynes and diethylzinc in the presence of 3,3′-bis(perfluorophenyl)BINOL as the chiral ligand to give the corresponding ketones bearing a trifluoromethylated propargylic quaternary stereocenter with fair to good enantioselectivities. Enones bearing a bulky 2-naphthyl attached to the carbonyl
β-芳基-β-三氟甲基烯酮的对映选择性共轭烷基化反应是在3,3'-双(全氟苯基)BINOL作为手性配体的情况下,使用末端炔烃和二乙基锌进行的,得到带有三氟甲基化炔丙基季铵盐的相应酮具有良好对映选择性的立体中心。带有与羰基相连的大体积2-萘基的烯酮提供最佳的对映选择性。所得产物的碘环化形成4 H-吡喃已证明了其合成的适用性。