Synthesis of monodentate ferrocenylphosphines and their application to the palladium-catalyzed Suzuki reaction of aryl chlorides

被引:91
作者
Pickett, TE
Roca, FX
Richards, CJ
机构
[1] Queen Mary Univ London, Dept Chem, London E1 4NS, England
[2] Cardiff Univ, Dept Chem, Cardiff CF10 3TB, S Glam, Wales
关键词
D O I
10.1021/jo0265479
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Racemic and enantiopure ((p)S)-1-bromo-2-methylferrocene 6 were synthesized in 4 steps from 2-(4,4-dimethyloxazolinyl)ferrocene and (S)-2-(4-methylethyloxazolinyl)ferrocene, respectively (46 and 81% overall yield). Bromolithium exchange and addition of ClPR(2) gave the corresponding racemic or enantiopure 2-methylferrocenyl phosphine ligands 2-MeFcPR(2) 11 (R = Ph), 12 (R = Cy), and 13 (R = (t)Bu) in 28-93% yield. Use Of PCl(3) gave the C(3)-symmetric phosphine (2-MeFc)(3)P 5 from ((p)S)-6 (72% yield) but racemic 6 did not lead to the formation of triferrocenyl phosphines. Combination of 5 and Pd(2)(dba)(3) gave an active catalyst for the Suzuki reaction of aryl chlorides, for example, 4-chlorotoluene and phenylboronic acid reacted at only 60 degreesC in dioxane (86% yield). Other examples are reported together with the use of 12 in this same protocol. From the X-ray crystal structure of 5 the cone angle was determined as 211degrees. With this, and the electronic character of 11, 12, and other phosphines (derived from nu(CO) of trans-[(R(3)P)(2)Rh(CO)Cl]), an analysis is made of the steric and electronic influences on ligand activity in the Suzuki reaction.
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页码:2592 / 2599
页数:8
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