Enantiopure Ruthenocenes Cp*Ru(1,2‐C
<sub>5</sub>
H
<sub>3</sub>
R
<sup>1</sup>
R
<sup>2</sup>
) with a Planar Chiral Cyclopentadienyl Ligand and a Pentamethylcyclopentadienyl Spectator Ligand
作者:Gerhard E. Herberich、Ulli Englert、Tobias Wirth
DOI:10.1002/ejic.200500686
日期:2005.12
quenching with electrophiles E–X gave enantiomerically pure (de > 98 %), 1,2-disubstituted complexes Cp*Ru(E–C5H3CH2–SMP) 10a–i with E = F, Cl, Br, I, Me, CD3, SiMe3, PPh2, Au(PPh3) as oils. The chiral auxiliary was removed from 10a, b, and f by quaternization with MeI and subsequent reductive cleavage with LiAlH4 in THF to afford the exclusively planar chiral complexes Cp*Ru(1-E-2-MeC5H3) 14a (E = F),
Kreutzberger 的合成用于从 1,3,5-三嗪、环戊二烯和吗啉 (94%) 生产 6-(吗啉代) 富烯 (7a)。同样使用(S)-2-(甲氧基甲基)吡咯烷(HSMP),获得6-[(S)-2-(甲氧基甲基)吡咯烷基]类似物7b(62%)。NaBHEt3 在甲苯中的氢化物加成得到环戊二烯化物 Na[C5H4CH2–N(C2H4)2O] (8a) (83%) 和 Na(C5H4CH2–SMP) (8b) (90%)。Cp*Ru(C5H4CH2–SMP) (5) 由 [Cp*RuCl]4 和 8b 合成(产率 84%)。相关的亚甲基亚胺盐 [Cp*Ru(C5H4CH=SMP)]PF6 (9) 由 [Cp*Ru(MeCN)3]PF6 和 7b 制成,并且可以通过在 THF 中从 LiAlH4 氢化物加成转化为 5。在 Et2O/环己烷中用 LisBu 对 5 进行非对映选择性锂化,随后用亲电试剂