An asymmetric hydrogenation of sterically hindered β,β-disubstituted enones has been well-established by using a ruthenium complex composed of an achiral diphosphane and a chiral diamine as catalyst, wherein the carbonyl group was selectively hydrogenated to give a wide range of chiral allylic alcohols with high levels of enantioselectivity and complete chemoselectivity.
A Ruthenium Catalyst with Simple Triphenylphosphane for the Enantioselective Hydrogenation of Aromatic Ketones
作者:Han Zhou、Hanmin Huang
DOI:10.1002/cctc.201300080
日期:2013.8
An efficient Ru catalyst constructed from simple and commercially available triphenylphosphane and enantiopure (1S,1′S)‐1,1′‐biisoindoline (BIDN) was applied to the asymmetric hydrogenation of aromatic ketones. A range of simple aromatic ketones could be hydrogenated with good to excellent enantioselectivities (up to 95 % ee). An appropriate enantioselective transition state was proposed to explain
Non-Heme Iron Catalysts with a Rigid Bis-Isoindoline Backbone and Their Use in Selective Aliphatic C−H Oxidation
作者:Jianming Chen、Martin Lutz、Michela Milan、Miquel Costas、Matthias Otte、Robertus J. M. Klein Gebbink
DOI:10.1002/adsc.201700239
日期:2017.8.7
from a bis‐isoindoline‐bis‐pyridine ligand platform based on the BPBP ligand (BPBP=N,N′‐bis(2‐picolyl)‐2,2′‐bis‐pyrrolidine) have been synthesized and applied in selective aliphatic C−H oxidation with hydrogen peroxide under mild conditions. The introduction of benzene moieties on the bis‐pyrrolidine backbone leads to an increased preference of tertiary over secondary C−H bond oxidation (3°/2° ratio
合成了基于BPBP配体的双异吲哚啉-双吡啶配体平台的铁配合物(BPBP = N, N' -bis(2- picolyl)-2,2' -bis-pyrrolidine)并将其应用于选择性在温和条件下用过氧化氢进行脂肪族CH的氧化。在双吡咯烷主链上引入苯部分会导致叔酸优先于仲CH键氧化(3°/ 2°比,最高33)。另一方面,用大体积的甲硅烷基取代吡啶的间位基团可提高仲CH的氧化选择性,并通常导致更高的产品收率和质量平衡。