Highly Stereoselective Synthesis of Novel Multistereogenic Bis<i>-</i>Bifunctional Ligands Based on [2.2]Paracyclophane- 4,7-quinone, their Structure Elucidation and Application in Asymmetric Catalysis
作者:Natalia Vorontsova、Evgenii Vorontsov、Dmitrii Antonov、Zoya Starikova、Kim Butin、Stefan Bräse、Sebastian Höfener、Valeria Rozenberg
DOI:10.1002/adsc.200404200
日期:2005.1
7-dihydro[2.2]paracyclophanes 3–6 were synthesized by a highly diastereoselective reaction of ortho-substituted aryllithium reagents with [2.2]paracyclophane-4,7-quinone (1). Enantiomerically pure diols 3–5 were tested as chiral inductors in the enantioselective addition of diethylzinc to benzaldehyde (up to 93.5% ee). Acid dehydration of cis-4,7-di(2-methoxyphenyl)-4,7-dihydroxy-4,7-dihydro[2.2]paracyclophane
双-双功能的顺式-4,7- diarylsubstituted -4,7-二羟基-4,7-二氢[2.2] paracyclophanes 3-6通过的高度非对映反应合成邻-取代的芳基锂试剂与[2.2]对环芳烷-4, 7-醌(1)。在将二乙基锌对苯甲醛(不超过93.5%ee)的对映选择性加入中,对映体纯的3-5二醇作为手性诱导剂进行了测试。的酸脱水顺-4,7-二(2-甲氧基苯基)-4,7-二羟基-4,7-二氢[2.2]对环芳烷(3)在4,7-二氢-7,8-二结果(2-甲氧基苯基)[2.2]对环庚烷-4-一(8)– [2.2]对环环烷系列的平面手性环己二酮,具有对-半喹啉亚结构。对化合物3、4和8进行了X射线研究。