The Asymmetric Ullmann Coupling Reaction of Chiral Diol Diesters of 1-Bromo-2-naphthoic Acid and 2-Halo-3-nitrobenzoic Acids: Highly Diastereoselective Synthesis of Atropisomeric 6,6′-Dinitrodiphenic Acids
作者:Sotaro Miyano、Shigeru Handa、Kunitoshi Shimizu、Katsuya Tagami、Harukichi Hashimoto
DOI:10.1246/bcsj.57.1943
日期:1984.7
2-ethanediol, 33%, S; (4S,5S)-bis(hydroxymethyl)-2,2-dimethyl-1,3-dioxolane, 3.7%, R. The reaction of (R)-1,1′-binaphthyl-2,2′-diol esters of 2-halo-3-nitrobenzoic acids gave up to 85% net optical yield for the coupling; the intramolecular cyclization proceeded with virtually complete diastereoselectivity to give cyclic diester of R,R-configuration in a 42% isolated yield. This remarkable stereocontrol
铜促进的 1-溴-2-萘甲酸手性二醇二酯的 Ullmann 反应导致轴不对称形成新形成的 1,1'-联萘键:手性二醇,连接两个萘基单元的表观净光学产率,和诱导的轴向手性如下:(S)-1,1'-binaphthyl-2,2'-diol, 71%, S; (1S,2S)-1,2-二苯基-1,2-乙二醇,32%,S;(1R,2R)-1,2-双(乙氧基羰基)-1,2-乙二醇,33%,S;(4S,5S)-双(羟甲基)-2,2-二甲基-1,3-二氧戊环, 3.7%, R. (R)-1,1'-联萘-2,2'-二醇酯的反应2-卤代-3-硝基苯甲酸的偶联净光学产率高达 85%;分子内环化以几乎完全的非对映选择性进行,以 42% 的分离产率得到 R,R-构型的环二酯。