Preparation of prolinamide with adamantane for aldol reaction catalysis in brine and separation using a poly(AN-MA-β-CD) nanofibrous film <i>via</i> host–guest interaction
as organocatalysts in asymmetric aldol reactions. The catalyst with adamantane showed improved catalytic activity, which was further enhanced by using brine as the solvent. A series of aldol reactions in brine at 0 °C provided good yields (up to 98%) with high diastereoselectivities (>99 : 1) and enantioselectivities (>99%). The prepared catalyst was adsorbed by a nanofibrous film of poly(AN-MA-β-CD)
制备了具有双氢电位的脯氨酰胺,并将其用作不对称羟醛反应的有机催化剂。含有金刚烷的催化剂显示出改进的催化活性,通过使用盐水作为溶剂进一步增强了催化活性。在 0 °C 的盐水中进行的一系列羟醛反应提供了良好的产率(高达 98%)以及高非对映选择性(>99:1)和对映选择性(>99%)。制备的催化剂在反应体系中通过主客体相互作用被聚(AN-MA-β-CD)纳米纤维膜吸附。通过超声波将催化剂从薄膜中分离出来,总回收率为96.2%。该催化剂可重复使用五次,非对映选择性和对映选择性没有显着变化。
An Acid/Base-Regulated Recyclable Strategy for Homogeneous Cinchona Alkaloid-Derived Primary Amine Organocatalysts in Aldol, Vinylogous Michael and Double-Michael Cascade Reactions
作者:Jingwei Wan、Zhiwei Zhao、Falu Wang、Xuebing Ma
DOI:10.1002/ejoc.201500566
日期:2015.9
reusability of the organocatalysts epi-CDNH2, DeMe-QNNH2 and H-CDNH2 over three cycles was investigated in detail. It was found that the organocatalysts were highly effective with respect to catalytic performance, including the yields and stereoselectivities. Furthermore, the recovered organocatalysts in the tenth cycle retained similar excellent enantioselectivities to fresh organocatalysts. However, the
a primary amine group and two amide units have been developed and evaluated in the directasymmetric intermolecular aldolreaction of 4-nitrobenzaldehyde and cyclohexanone. When 2,4-dinitrophenol (DNP) was used as an acidic additive, the catalyzedreactions of various aldehydes and ketones gave the corresponding aldol products with moderate to high enantioselectivities (up to 95%) and diastereoselectivities
A series of Cinchona alkaloids derived organocatalysts have been developed and evaluated in the directasymmetric intermolecular aldolreaction of 4-nitrobenzaldehyde and cyclohexanone. The catalyzedreactions of various aldehydes and ketones gave the corresponding aldol products with moderate to high enantioselectivities (up to 92%) and diastereoselectivities (up to >99/1, anti/syn) in the presence
在 4-硝基苯甲醛和环己酮的直接不对称分子间羟醛反应中开发并评估了一系列金鸡纳生物碱衍生的有机催化剂。在盐水中存在 3e 的情况下,各种醛和酮的催化反应得到了相应的醛醇产物,具有中到高的对映选择性(高达 92%)和非对映选择性(高达 >99/1,anti/syn)。图形摘要
Sulfonation of pyrene-based metal–organic framework for the encapsulation of chiral organocatalyst and application in asymmetric aldol addition
作者:Congwei Gao、Xingtao Deng、Jianing Zhang、Xuebing Ma
DOI:10.1016/j.apcata.2022.119003
日期:2023.1
Encapsulation of bulky chiralchiralorganocatalysts into metal-organicframeworks (MOFs) is a challenge because of difficult control on the crystallinity of MOFs. Herein, Zr6(μ3-OH)8(OH)8TBAPy)2 (NU-1000) with is sulfonated at − 30 °C by ClSO3H at low concentration, and then bulky cinchona alkaloid-derived chiral primary amines, 9-amino (9-deoxy)epi-quinine (QNNH2) and 9-amino(9-deoxy) epi-cinchonidine
将大体积手性手性有机催化剂封装到金属有机骨架 (MOF) 中是一项挑战,因为很难控制 MOF 的结晶度。在此,Zr 6 ( μ 3 -OH) 8 (OH) 8 TBAPy) 2 (NU-1000) with 在− 30 °C 下被低浓度的 ClSO 3 H 磺化,然后生成庞大的金鸡纳生物碱衍生的手性伯胺, 9-氨基(9-脱氧)表-奎宁 (QNNH 2 ) 和 9-氨基(9-脱氧)表-辛可尼定(CDNH 2 ) 通过酸碱反应固定在 NU-1000 上。摩尔比为 QNNH 2 /-SO 3H = 0.96,NU-1000 支持的 QNNH 2具有高表面积 (677 m 2 g −1 )、大孔体积 (0.48 cc g −1 ) 和最可能的 3.0 nm 孔径显示高产率 (86–95 %)在环己酮与带有吸电子基团的苯甲醛(-NO 2和 -CN )的不对称羟醛反应中具有良好至优异的非对映选择性(反/顺=