Very Efficient Phosphoramidite Ligand for Asymmetric Iridium-Catalyzed Allylic Alkylation
作者:Alexandre Alexakis、Damien Polet
DOI:10.1021/ol048607y
日期:2004.9.1
[reaction: see text] Linear or branched allylic carbonates or acetates undergo enantioselective iridium-catalyzedallylic substitution with sodium malonate. The reaction is wide in scope and affords the branched product in high yield and with high regio- (up to >99:1) and enantioselectivity (up to 98%). Ten aromatic or aliphatic substrates were successfully tested.
Synthesis of 1-[bis(trifluoromethyl)phosphine]-1’-oxazolinylferrocene ligands and their application in regio- and enantioselective Pd-catalyzed allylic alkylation of monosubstituted allyl substrates
作者:Zeng-Wei Lai、Rong-Fei Yang、Ke-Yin Ye、Hongbin Sun、Shu-Li You
DOI:10.3762/bjoc.10.126
日期:——
linylferrocene ligands has been synthesized from ferrocene. It became apparent that these ligands can be used in the regio- and enantioselective Pd-catalyzed allylic alkylation of monosubstituted allyl substrates in a highly efficient manner. Excellent regio- and enantioselectivity could be obtained for a wide range of substrates.
An Ir-catalyzed asymmetric allylic alkylation using chiral diaminophosphine oxide is described. Asymmetric allylic alkylation of terminal allylic carbonates proceeded using 5 mol % of Ir catalyst, 5 mol % of DIAPHOX 1i, 10 mol % of NaPF6, 10 mol % of LiOAc, and N,O-bis(trimethylsilyl)acetamide (BSA), affording the corresponding branched products in excellent yield and in up to 95% ee. The developed
Ferrocenyliminophosphites as Easy-to-Modify Ligands for Asymmetric Catalysis
作者:Konstantin N. Gavrilov、Marina G. Maksimova、Sergey V. Zheglov、Oleg G. Bondarev、Eduard B. Benetsky、Sergey E. Lyubimov、Pavel V. Petrovskii、Anzhelika A. Kabro、Evamarie Hey-Hawkins、Sergey K. Moiseev、Valery N. Kalinin、Vadim A. Davankov
DOI:10.1002/ejoc.200700396
日期:2007.10
phosphite-type ligands derived from readily available ferrocene-based iminoalcohols were successfully used in Rh-catalysed hydrogenations and Pd-catalysed allylic substitutions of a variety of substrates. Moderate-to-high catalytic activities under standard conditions were observed, and the enantiomeric excess of the products were up to 97 %. Results obtained under systematic variation of the ligand parameters
well-defined tridentate chiral sulfoxide-N-olefin ligand has been designed and applied in rhodium-catalyzed asymmetric allylicsubstitutions of racemic allyliccarbonates, providing the branched allylic products in good yields with good to high enantioselectivities and excellent regioselectivities. This reaction mechanism, which involves the possible hemilability of olefin coordination on sulfoxide-N-olefin