The modified-Mannich reaction: Conversion of arylboronic acids and subsequent coupling with paraformaldehyde and amines toward the one-pot synthesis of Mannich bases and benzoxazines
作者:Juan Liu、Gaoqing Yuan
DOI:10.1016/j.tetlet.2017.02.081
日期:2017.4
A modified Mannichreaction has been developed for the synthesis of Mannichbases and benzoxazines via the oxidative hydroxylation of arylboronic acids and subsequent coupling with paraformaldehyde and amines in one pot. This modified Mannichreaction is easily carried out to afford the target products in good to excellent yields and tolerates a variety of functional groups.
A Modified Mannich-Type Reaction Catalyzed by VO(acac)<sub>2</sub>
作者:Der-Ren Hwang、Biing-Jiun Uang
DOI:10.1021/ol017229j
日期:2002.2.1
A facile VO(acac)(2)-catalyzed in situ generation of iminium ions from amine N-oxides and their participation in a modified Mannich-type reaction is described.
TASHIRO, MASASHI;SAEKI, KATSUNORI;TSUZUKI, HIROHISA;MATAKA, SHUNTARO;HATT+, KYUSYU DAJGAKU KINO BUSSITSU KAGAKU KEHNKYUDZE XOKOKU, 2,(1988) N, S. 79-+
Cu(II)-Catalyzed <i>ortho</i>-Selective Aminomethylation of Phenols
作者:Jin-Ling Dai、Nan-Qi Shao、Jin Zhang、Run-Ping Jia、Dong-Hui Wang
DOI:10.1021/jacs.7b06785
日期:2017.9.13
A Cu(II)-catalyzed ortho-selective functionalization of free phenols with trifluoroborates to afford Csp2-Csp3 coupling products under mild conditions has been developed. A variety of functional groups on the phenol and the potassium aminomethyltrifluoroborate substrates were found compatible, furnishing the corresponding products in moderate to excellent yields. A single-electron transfer radical
Acetylacetone Covalent Triazine Framework: An Efficient Carbon Capture and Storage Material and a Highly Stable Heterogeneous Catalyst
作者:Himanshu Sekhar Jena、Chidharth Krishnaraj、Guangbo Wang、Karen Leus、Johannes Schmidt、Nicolas Chaoui、Pascal Van Der Voort
DOI:10.1021/acs.chemmater.8b01409
日期:2018.6.26
catalyst come from the coordination of the vanadyl ions to the acetyl acetonate groups present in the material. The strong metalation is confirmed from Fourier transform infrared analysis, 13C MAS NMR spectral analysis, and X-ray photoelectron spectroscopy measurement. Detailed characterization of the [email protected] reveals that electron donation from O∧O of the acetylacetonate group to VO(acac)2,
我们首次提出用乙酰丙酮酸酯基团(acac-CTFs)功能化的共价三嗪框架。它们是由4,4'-丙二酰二苯甲腈在电热条件下聚合而制得的,BET表面积高达1626 m 2 / g。该材料显示出出色的CO 2吸收率(在273 K和1 bar下为3.30 mmol / g),H 2储存容量(在77 K和1 bar下为1.53 wt%)和良好的CO 2 / N 2选择性(在90 K下可达46)。 298 K)。由于整个材料中都存在双极性位点(N和O),因此提高了CO 2吸收值和良好的选择性。此外,使用acac-CTF固定VO(acac)2作为非均相催化剂。[受电子邮件保护]对于改性的曼尼希型反应显示出优异的反应性和可重复使用性,其周转数高于均相催化剂。催化剂的较高反应性和可重复使用性来自钒离子与材料中存在的乙酰丙酮酸基团的配位。通过傅里叶变换红外分析,13 C MAS NMR光谱分析和X射线光电子能谱