Synthesis of 3-trialkylsilyl pyrazoles from β-oxo acylsilanes
摘要:
The synthesis of beta -oxo acylsilanes via cyclic sulfates is described and applied to carbohydrates. These compounds are used for the synthesis of new silylated pyrazoles linked to a carbohydrate moiety by the addition of hydrazines. The regiochemistry of the reaction was determined by NMR analyses (H-1/C-13 and H-1/N-15 correlations). (C) 2000 Elsevier Science Ltd. All rights reserved.
Aluminum-Catalyzed Formation of Functional 1,3,2-Dioxathiolane 2-Oxides from Sulfur Dioxide: An Easy Entry towards<i>N</i>-Substituted Aziridines
作者:Victor Laserna、Eddy Martin、Eduardo C. Escudero-Adán、Arjan W. Kleij
DOI:10.1002/adsc.201600831
日期:2016.12.7
Aluminum(III) complexes derived from aminotriphenolate ligands are shown to be excellent catalysts for the formation of cyclic sulfites from a range of (functionalized) terminal and internal epoxides, and ex situ generated sulfur dioxide. The developed catalytic protocol is characterized by its operational simplicity, wide scope in epoxide reaction partners, good to excellent isolated yields and mild
A Copper Metal–Organic Hydrogel as a Catalyst for SO
<sub>2</sub>
and CO
<sub>2</sub>
Fixation under Ambient Conditions
作者:Chandane Kumar Karan、Manish Bhattacharjee
DOI:10.1002/ejic.201900594
日期:2019.8.25
gelator. The metallohydrogel exhibits pH‐responsive nature as well as chemical responsiveness. Besides, it shows rapid thixotropic behavior when external mechanical forces are applied. The metal–organic hydrogel can be used as a heterogeneous catalyst for the reaction of SO2 and CO2 with epoxides to produce cyclic 1,3,2‐dioxathiolane‐2‐oxides and carbonates, respectively. The conversions were found to be
使用基于氨基酸的配体Na 2 HL H 3 L = 2-((3,5-二叔丁基-2-羟基苄基)氨基琥珀酸}}合成了铜金属有机水凝胶(MOG)作为胶凝剂。金属水凝胶具有pH响应性和化学响应性。此外,当施加外力时它表现出快速的触变性。金属有机水凝胶可用作SO 2和CO 2与环氧化物反应分别生成环状1,3,2-二氧杂硫杂环戊烷-2-氧化物和碳酸盐的非均相催化剂。发现转化率取决于环氧化物侧链的大小和类型。