Synthesis, Crystal Structure of Chiral Ferrocenyl Amino Alcohols, and Its Use for Asymmetric Transfer Hydrogenation
作者:Y. M. Zhang、P. Q. Li、P. Liu
DOI:10.1134/s1070328418110106
日期:2018.11
AbstractTwo chiral ferrocenyl amino alcohols (IIIa and IIIb) have been synthesized for the iridium catalyzed asymmetric transfer hydrogenation of aromatic ketones. The structures of two chiral ferrocenyl amino alcohols have been determined by single crystalX-ray diffraction (CIF files CCDC nos. 1056737 (IIIa) and 1056734 (IIIb)). The results show that the activity and enantioselectivity of the chiral iridium
the resulting mixed titanium reagents undergo addition to aldehydes with high enantioselectivities (typically >90% ee) and high yields. The method is applicable to various combination of aldehydes (R 1 CHO; R 1 = aryl, heteroaryl, 1-alkenyl, and alkyl) and Grignard reagents (R 2 MgX; R 2 = primary alkyl and aryl). Thus, a variety of enantiomerically enriched secondary alcohols (R 1 CH*(OH)R 2 ) can
This work disclosed a highly enantioselective hydrogenation of non-ortho-substituted 2-pyridyl arylketones via Ir/f-diaphos catalysis. This catalytic system allows for full control over the configuration of the stereocenter, affording two enantiomers of the desired products with extremely high enantioselectivity (up to >99% ee in most cases) and excellent reactivity (TON of up to 19600, TOF of 1633
design strategy to enhance the enantioselectivity of Candida antarctica lipase B (CALB) mutants towards bulky pyridyl(phenyl)methanols. Compared to W104A mutant previously reported with reversed S‐stereoselectivity toward sec‐alcohols, three mutants (W104C, W104S and W104T) displayed significant improvement of S‐enantioselectivity in the kineticresolution (KR) of various phenyl pyridyl methyl acetates due
Chiral square-planar Rh(I) complexes based on new C2-symmetric NHC ligands have been synthesized selectively in a few steps as single diastereoisomers. These chiral precatalysts were applied to the asymmetric transfer hydrogenation of 1-phenylpropanone and to the 1,2-addition of arylboronic acids to aldehydes. We demonstrated a proper functionalization of the aromatic rings connected to the nitrogen