Highly Regioselective Coupling Reactions of Allylic and Propargylic Alcohol Derivatives with γ,γ-Dialkoxyallylic Zirconium Species via Zr-to-Cu Transmetalation
作者:Azusa Sato、Hisanaka Ito、Takeo Taguchi
DOI:10.1021/jo0489216
日期:2005.1.1
In the presence of CuCN, reaction of γ,γ-dialkoxyallylic zirconium species 4, generated in situ by treating triethyl orthoacrylate with zirconocene−butene complex, with allylic and propargylic phosphates proceeded at the α-position of 4 in a highly SN2‘-selective manner to give the corresponding 5-alkenoates and 4,5-alkadienoates, respectively. In the present Cu(I)-mediated coupling reaction, the γ
在存在CuCN的情况下,通过用锆茂茂-丁烯配合物处理原丙烯酸三乙酯与烯丙基和炔丙基磷酸酯在高S N 2'中在4的α位进行原位生成的γ,γ-二烷氧基烯丙基锆物种4的反应。选择性地分别得到相应的5-链烯酸酯和4,5-链二烯酸酯。在当前的Cu(I)介导的偶联反应中,γ,γ-二烷氧基烯丙基锆物种4用作丙酸酯的合成有用的均烯酸酯阴离子当量。