An efficient method for the synthesis of acylals from aldehydes using silica-supported perchloric acid (HClO4–SiO2)
作者:Vinod T. Kamble、Vasant S. Jamode、Neeta S. Joshi、Ankush V. Biradar、Rameshchandra Y. Deshmukh
DOI:10.1016/j.tetlet.2006.05.125
日期:2006.7
The synthesis of acylals from structurally diverse aldehydes has been performed in excellent yields under solvent-free conditions using HClO4–SiO2 as a mild, convenient, reusable, and heterogeneous catalyst. The procedure is operationally simple, environmentally benign and has the advantage of enhanced atom utilization. Furthermore, the catalyst can be recovered simply and reused efficiently a number
Zinc Tetrafluoroborate-Catalyzed Efficient Conversion of Aldehydes to Geminal Diacetates and Cyanoacetates
作者:Brindaban C. Ranu、Jyotirmoy Dutta、Arijit Das
DOI:10.1246/cl.2003.366
日期:2003.4
A trace of an aqueous solution of zinc tetrafluoroborate was demonstrated to catalyze the conversion of an aldehyde to its 1,1-diacetate by acetic anhydride without any solvent. A similar reaction of an aldehyde with a mixture of potassium cyanide and acetic anhydride in methylene chloride was also catalyzed by Zn(BF4)2 to provide the corresponding geminal cyanoacetate.
HBF 4 -SiO 2 has been found to be an outstanding catalyst for the protection of carbonyl compounds as acylals under entirely solvent-free conditions. Some of the major advantages of this procedure are high yields, ease of operation, high chemoselectivity, high atom efficiency, and compatibility with other protecting groups.
[EN] VOLTAGE-GATED SODIUM CHANNEL BLOCKERS<br/>[FR] BLOQUEURS DES CANAUX SODIQUES VOLTAGE-DÉPENDANTS
申请人:GLAXO GROUP LTD
公开号:WO2013006596A1
公开(公告)日:2013-01-10
In general, the present invention relates to uses of voltage-gated sodium channel blocker compounds,, which include corresponding precursors, intermediates, monomers and dimers, corresponding pharmaceutical compositions, compound preparation and treatment methods for respiratory and respiratory tract diseases. In particular, the present invention also relates to methods and uses for treatment of respiratory or respiratory tract diseases, which comprises administering to a subject in need thereof an effective amount of a compound of the present invention.
catalyst for the synthesis of a series of pyranopyrazole derivatives via a one-pot, four-component reaction of carbonyl compound or isatin, hydrazine hydrate, malononitrile, and β-keto ester in EtOH–H2O. The catalyst was found to work extremely for aldehydes, ketones or isatins at room temperature to give the corresponding dihydropyrano[2,3-c]pyrazole or spiro[indoline-3,4′-pyrano[2,3-c]pyrazole] derivatives
证明葡甲胺是一种生物基化学物质,它是通过羰基化合物或靛红,水合肼,丙二腈和β的单锅四组分反应合成一系列吡喃并吡唑衍生物的高效且可重复使用的催化剂。酮的EtOH-H酯2 O.将催化剂在室温下发现极其对醛,酮或靛红工作以得到相应的二氢吡喃并[2,3- c ^ ]吡唑或螺[二氢吲哚-3,4'-吡喃并并[2,3- c ^ ]吡唑]衍生物以高产率。这个新方法的显着特点是广泛的底物范围,室温下的反应条件,反应时间短,产量高,容易进行后处理过程中,催化剂的可重用性,并且不存在有害的有机溶剂。