4-(Succinimido)-1-butane sulfonic acid as a Brönsted acid catalyst for the synthesis of pyrano[4,3-b]pyran derivatives using thermal and ultrasonic irradiation
作者:Nader Ghaffari Khaligh、Sharifah Bee Abd Hamid
DOI:10.1016/s1872-2067(14)60307-7
日期:2015.5
Abstract 4-(Succinimido)-1-butane sulfonic acid was shown to be an efficient and reusable Bronsted acid catalyst for the synthesis of pyrano[4,3- b ]pyran derivatives using thermal and ultrasonic conditions. The catalyst was prepared by mixing succinimide and 1,4-butanesultone, which is simpler and safer than the preparation of succinimide sulfonic acid. This method has the advantages of high yield
1H-imidazol-3-ium tricyanomethanide {[HIM]C(CN)3} as a nanostructured molten salt catalyst: application to the synthesis of pyrano[4,3‐b]pyrans
作者:Mohammad Ali Zolfigol、Meysam Yarie、Saeed Baghery、Abbas Khoshnood、Diego A. Alonso
DOI:10.1007/s11164-016-2826-y
日期:2017.5
Additionally, the catalytic activity of [HIMI]C(CN)3} (1, 2 mol%) has been tested in a three-component domino Knoevenagel condensation reaction. A range of structurally diverse aromatic aldehydes (2a–p), malononitrile (3), and 4‐hydroxy‐6‐methyl‐2 H ‐pyran‐2‐one (4) are tolerated for the synthesis of 2-amino-7-methyl-5-oxo-4-aryl-4,5-dihydropyrano[4,3-b]pyran-3-carbonitrile derivatives (5a–p) under neat conditions
Tertiary amine-bisquaternary ammonium functionalized polyacrylonitrile fiber for catalytic synthesis of pyran-annulated heterocycles
作者:Chima E. Anyaegbu、Haonan Zhang、Jian Xiao、Minli Tao、Ning Ma、Wenqin Zhang
DOI:10.1016/j.reactfunctpolym.2022.105201
日期:2022.3
fiber supported bisquaternary ammoniumsalts with varying interchain quaternaryammonium (QA) to tertiary amine (TA) ratio, counter ions and linker groups were prepared and characterized by TGA, FTIR, XPS, XRD, SEM, EA and water contact angle. The functionalized fibers were used to catalyze three-component reaction (3CR) and tandem deacetalization-3CR for the synthesis of pyrano[4,3-b]pyrans, pyrano[3
制备了具有不同链间季铵 (QA) 与叔胺 (TA) 比例、抗衡离子和连接基团的聚丙烯腈纤维负载双季铵盐,并通过 TGA、FTIR、XPS、XRD、SEM、EA 和水接触角对其进行了表征。功能化纤维用于催化三组分反应(3CR)和串联脱缩醛化-3CR,用于合成吡喃[4,3- b ]吡喃、吡喃[3,2- c ]色烯和吡喃[3,2- c] 喹啉在乙醇-水混合物中。在时间、温度、催化剂用量和溶剂等不同反应条件下,考察了制备的纤维催化剂的催化能力。在最佳条件下,在制备的纤维催化剂中,具有醋酸抗衡离子且链间 QA 与 TA 比为 1:1 的双季铵纤维(PAN BQAc F)表现出最好的催化活性,可连续使用 10 次。催化活性仅略有下降。有趣的是,PAN BQAcF可以有效地催化串联脱缩醛-Knoevenagel反应和相关的新型串联脱缩醛-3CRs,用于合成吡喃环化杂环。在串联脱缩醛化反应中,乙酸根离子在促进质子转移方面发挥着重要作用,这使得
Pyrano [3,2-C] Pyridones and Related Heterocyclic Compounds as Pharmaceutical Agents for Treating Disorders Responsive to Apoptosis, Antiproliferation or Vascular Disruption, and the Use Thereof
申请人:Kornienko Alexander
公开号:US20090247566A1
公开(公告)日:2009-10-01
A pharmaceutical composition comprising a pharmaceutically acceptable excipient or carrier and a compound Formula I:
or a pharmaceutically acceptable salt or prodrug thereof.
一种药物组合物,包含药用可接受的辅料或载体和化合物公式I:或其药用可接受的盐或前药。
4-(Succinimido)-1-butane sulfonic acid as a Brönsted acid catalyst for synthesis of pyrano[4,3-b]pyran derivatives under solvent-free conditions
作者:Nader Ghaffari Khaligh
DOI:10.1016/j.cclet.2014.10.009
日期:2015.1
4-(Succinimido)-1-butane sulfonic acid as an efficient and reusable Bronsted acid catalyzed the synthesis of pyrano[4,3-b]pyran derivatives under solvent-free conditions. The catalyst can be prepared by mixing succinimide and 1,4-butanesultone that is more simple and safer than the preparation of succinimide sulfonic acid. This method has the advantages of high yield, clean reaction, simple methodology and short reaction time. The catalyst could be recycled without significant loss of activity. (C) 2014 Nader Ghaffari Khaligh. Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. All rights reserved.