1,2,3,4-Tetrasubstituted Cyclopentadienes and Their Applications for Metallocenes: Efficient Synthesis through Zirconocene- and CuCl-Mediated Intermolecular Coupling of Two Alkynes and One Diiodomethane
作者:Weizhi Geng、Chao Wang、Jie Guang、Wei Hao、Wen-Xiong Zhang、Zhenfeng Xi
DOI:10.1002/chem.201300416
日期:2013.6.24
1,2,3,4‐Tetrasubstituted cyclopentadienes and indene derivatives with identical or different substituents were obtained in good to excellent isolated yields through a zirconocene‐ and CuCl‐mediated intermolecular coupling process. This synthetic procedure involved three organic partners, including one CH2I2, and two different or identical alkynes. Two alkynes or one diyne undergo Cp2ZrII‐mediated (Cp=η5‐C5H5)
通过锆茂和CuCl介导的分子间偶联过程,可以很好地分离出1,2,3,4-四取代的环戊二烯和具有相同或不同取代基的茚衍生物。该合成过程涉及三个有机伙伴,包括一个CH 2 I 2和两个不同或相同的炔烃。两个炔或一个二炔经历的Cp 2 Zr的II介导的(CP =η 5 -C 5 H ^ 5)对选择性还原偶合,得到相应的zirconacyclopentadiene衍生物,其反应,在氯化亚铜的存在和1,3-二甲基3,4,5,6-四氢-2(1 H)-嘧啶酮(DMPU),带有CH 2I 2通过分子间,然后通过分子内偶联得到环戊二烯衍生物。所制备的四取代的环戊二烯衍生物的应用是由相应的锆配合物的简便合成[(证明4R CP)2的ZrCl 2 ]和[(4R CP)2 ZRR' 2 ](R'=甲基,乙基,或Ñ卜)。独特的1,2,3,4-四取代的环戊二烯配体和相应的茂金属有望在有机金属化学和有机合成中进一步应用。