Synthesis of Chiral γ,γ-Disubstituted γ-Butenolides via Direct Vinylogous Aldol Reaction of Substituted Furanone Derivatives with Aldehydes
作者:Takaaki Sakai、Shin-ichi Hirashima、Yasuyuki Matsushima、Tatsuki Nakano、Daiki Ishii、Yoshifumi Yamashita、Kosuke Nakashima、Yuji Koseki、Tsuyoshi Miura
DOI:10.1021/acs.orglett.9b00574
日期:2019.4.19
An organocatalyzed method for synthesizing chiral γ,γ-disubstituted γ-butenolides via direct vinylogous aldol reactions of γ-substituted β,γ-butenolides with aldehydes is reported. This reaction is catalyzed by a squaramide–sulfonamide organocatalyst to afford a range of anti-aldol adducts possessing vicinal quaternary and tertiary stereocenters with high to excellent enantioselectivities (reaching
报道了一种有机催化的方法,该方法通过γ-取代的β,γ-丁烯内酯与醛类的直接乙烯醇醛醇醛缩合反应合成手性γ,γ-二取代的γ-丁烯内酯。该反应由方酰胺-磺酰胺有机催化剂催化,可提供一系列具有邻位四级和三级立体中心且对映选择性高(达到95%ee)的抗羟醛加合物。这是醛与γ-取代的β,γ-丁烯内酯成功进行立体选择性直接乙烯基醇醛醇醛缩醛反应的首次报道。