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[求助]
【求助摘要翻译】+【化学】
New optically active 2,2'-bis(oxazolyl)-1,1'-binaphthyls (boxax) bearing various substituents (methoxycarbonyl,trimethylsilyl, (dimethylamino)carbonyl, formyl, and iodo) at their C3 and C3'positions were prepared via ortho-lithiation promoted by the oxazolyl groups. The 3,3'-disubstituted boxax ligands showed much higher enantioselectivity than the 3,3'-unsubstituted ones in the palladium-(II)-catalyzed Wacker-type cyclization of an o-allylphenol. The cyclization of (E)-2-(2-methyl-2-butenyl)phenol (10) in the presence of a cationic palladium catalyst coordinated with (S)-2,2'-bis(4,4-dimethyloxazol-2-yl)-3,3'-bis(methoxycarbonyl)-1,1'-binaphthyl gave (S)-2-ethenyl-2-methyl-2,3-dihydrobenzofuran of 96% ee.
英翻中,谢谢。所涉及图片如下
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