An easily available N,N′-dioxide/Cu(I) complex has been developed for the catalyticasymmetric nitroaldol (Henry) reaction of aldehydes with nitroethane. Under mild reaction conditions, a series of substituted aromatic, heteroaromatic and α,β-unsaturated aldehydes are transformed to the corresponding anti-β-nitroalcohols in good to excellent yields (up to 99%) with moderate to good dr (up to 16.7:1
已开发出一种易于获得的N,N'-二氧化物/ Cu(I)络合物,用于醛与硝基乙烷的催化不对称硝基醛醇(Henry)反应。下温和的反应条件下,一系列的取代的芳族,杂芳族和α,β -不饱和醛转化为相应的抗-β-硝基醇以良好至优异的产率(高达99%)的中度至良好博士(高达1670: 1 anti / syn)和高ee值(高达97%)。除硝基乙烷外,还使用硝基甲烷和1-硝基丙烷作为亲核试剂,并获得了良好的对映选择性。
Catalytic anti-selective asymmetric Henry (nitroaldol) reaction catalyzed by Cu(I)–amine–imine complexes
作者:Yao Qiong Ji、Gao Qi、Zaher M.A. Judeh
DOI:10.1016/j.tetasy.2011.12.010
日期:2011.12
derived from N-methyl-C1-tetrahydro-1,1′-bisisoquinolines (R)-1b and Cu(I)Cl promoted the diastereoselective Henry reaction of nitroethane with a series of aromatic and aliphatic aldehydes. The nitroalcohol adducts were obtained in excellent yields (up to 95%), moderate anti-selectivity (up to 2.6:1), and good enantioselectivity (up to 92% ee) without any special precautions to exclude moisture or air
Binaphthyl-Proline Hybrid Chiral Ligands: Modular Design, Synthesis, and Enantioswitching in Cu(II)-Catalyzed Enantioselective Henry Reactions
作者:Chao Yao、Yaoqi Chen、Chao Wang、Ruize Sun、Haotian Chang、Ruiheng Jiang、Lin Li、Xin Wang、Yue-Ming Li
DOI:10.1021/acs.joc.2c01127
日期:——
Chiral O–N–N tridentate ligands were designed from proline and BINOL. Their design strategy and performance were evaluated using a copper(II)-catalyzed asymmetric Henryreaction as a model. The desired β-nitroalcohols were obtained in up to 94% ee’s. Preliminary results suggested that the stereofacial selection of the reactions was mainly controlled by the chiral diamine moiety derived from proline
A Heterobimetallic Pd/La/Schiff Base Complex foranti-Selective Catalytic Asymmetric Nitroaldol Reactions and Applications to Short Syntheses of β-Adrenoceptor Agonists
作者:Chatterjee, Ayon、Priyanka、Prabhu, N. Prakash、Padhi, Santosh Kumar
DOI:10.1021/acscatal.4c04000
日期:——
(DHR) is an effective direct C–C bond ligation transformation that enables the synthesis of β-nitroalcohols having two contiguous chiral centers. Despite significant applications of opticallyactive β-nitroalcohol diastereomers as key chiral intermediates for the synthesis of important pharmaceuticals and biologically active molecules, the biocatalytic asymmetric Henry reaction remains underdeveloped
非对映选择性亨利反应 (DHR) 是一种有效的直接 C-C 键连接转化,能够合成具有两个连续手性中心的 β-硝基醇。尽管光学活性β-硝基醇非对映异构体作为合成重要药物和生物活性分子的关键手性中间体具有重要应用,但生物催化不对称亨利反应仍然不发达。在这里,我们发现具有单氨基酸取代 Y14C 和 Y14A的拟南芥羟基腈裂合酶 ( At HNL) 变体使混杂的 DHR 具有对不同醛和硝基烷烃的广泛合成范围以及高对映和非对映选择性(高达 >99% ee) , >99% de , >99% ic , 和 ∼3470 总周转数)在多种抗(1 R ,2 S )-β-硝基醇的生产中。 Y14C 在立体选择性硝基乙烷加成苯甲醛方面的催化效率比野生型显着提高了 250 倍以上。使用现成的苯甲醛和硝基乙烷说明了克级生物催化作用,然后对产物进行一步化学还原,以制备L-去甲麻黄碱,这是一种治疗剂,其ee和de含量 >