Diazepinium perchlorate: a neutral catalyst for mild, solvent-free acetylation of carbohydrates and other substances
作者:Santosh Kumar Giri、Rajesh Gour、K. P. Ravindranathan Kartha
DOI:10.1039/c6ra28882k
日期:——
protecting groups such as TBDMS/TBDPS/Tr ethers and isopropylidene/benzylidene acetals present on a substrate unaffected. Regioselective hydroxyl protection in partially protected carbohydrate derivatives/polyhydroxylic compounds was possible and was proved to be a convenient time-saving alternative to the conventional synthesis of such compounds. Easy preparation of the catalyst, mild reaction conditions
A new ferrocene-based bulky pyridine as an efficient reusable homogeneous catalyst
作者:Bishwapran Kashyap、Prodeep Phukan
DOI:10.1039/c3ra41674g
日期:——
An effective approach to reusing a homogeneous catalyst has been demonstrated. A ferrocene-based bulky pyridine has been synthesized and utilized as a homogeneous catalyst for the synthesis of benzoylfumarates as well as for acetylation. After the reaction, the catalyst was separated by simple precipitation and reused without appreciable loss of activity.
and spectroscopic (ICP-EOS, XPS) analysis tools. The metal composite was effectively employed in the unprecedented heterogeneously Ni-assisted cross-coupling reaction of aryl/vinyl iodides and thiocarboxylates. A range of sulfur-containing aryl as well as vinylderivatives (15 examples) was achieved in high yields (up to 82%), under mild reaction conditions, and with wide functional group tolerance
制备了一种新型的无配体镍纳米颗粒支撑在 rGO 上(平均粒径分布 d = 9 ± 3 nm),并通过形态学 (Fe-SEM)、结构学 (P-XRD、HR-TEM) 和光谱学进行了充分表征(ICP-EOS, XPS) 分析工具。该金属复合物有效地用于芳基/乙烯基碘化物和硫代羧酸盐的前所未有的非均相 Ni 辅助交叉偶联反应。在温和的反应条件和广泛的官能团耐受性下,以高产率(高达 82%)获得了一系列含硫芳基和乙烯基衍生物(15 个实例)。
Bromine catalyzed conversion of S-tert-butyl groups into versatile and, for self-assembly processes accessible, acetyl-protected thiols
作者:Alfred Błaszczyk、Mark Elbing、Marcel Mayor
DOI:10.1039/b408677e
日期:——
The facile and efficient conversion of a tert-butyl protecting group to an acetyl protecting group for thiols by catalytic amounts of bromine in acetyl chloride and the presence of acetic acid has been developed. The fairly mild reaction conditions are of particular interest for new protecting group strategies for sulfur functionalised target structures.