Conventional methods generate nitrile oxides from oxime halides in organic solvents under basic conditions. However, the present work revealed that water‐assisted generation of nitrile oxides proceeds under mild acidic conditions (pH 4–5). Cycloadditions of nitrile oxides with alkynes and alkenes easily occurred in water without using catalysts, thus yielding isoxazoles and isoxazolines, respectively
Efficient synthesis of isoxazoles and isoxazolines from aldoximes using Magtrieve™ (CrO2)
作者:Sandeep Bhosale、Santosh Kurhade、Uppuleti Viplava Prasad、Venkata P. Palle、Debnath Bhuniya
DOI:10.1016/j.tetlet.2009.04.073
日期:2009.7
Treatment of aldoximes 1 with Magtrieve™ (CrO2) in presence of dipolarophile 3 or 4, furnished a variety of isoxazolines 5a–u and isoxazoles 6a–q as 1,3-dipolar cycloaddition (1,3-DC) products (38 examples; 63–90% isolated yields). In situ formation of a nitrile oxide intermediate was confirmed through isolation of the dimerization product furoxane 2a in absence of any dipolarophile. The methodology
[EN] INHIBITORS OF DIACYLGLYCEROL ACYL TRANSFERASE<br/>[FR] INHIBITEUR DE DIACYLGLYCÉROL ACYLTRANSFÉRASE
申请人:PIRAMAL LIFE SCIENCES LTD
公开号:WO2011080718A1
公开(公告)日:2011-07-07
The present invention relates to heterocyclic compounds in all their stereoisomeric and tautomeric forms; and their pharmaceutically acceptable salts, pharmaceutically acceptable solvates and pharmaceutically acceptable polymorphs. The invention also relates to processes for the manufacture of the heterocyclic compounds and to pharmaceutical compositions containing them. The said compounds and their pharmaceutical compositions are useful in the prevention and treatment of diseases or disorders mediated by diacylglycerol acyltransferase (DGAT), particularly DGAT1. The present invention further provides a method of treatment of such diseases or disorders by administering a therapeutically effective amount of said compounds or their pharmaceutical compositions, to a mammal in need thereof.
One-Pot Preparation of 3-Arylisoxazole-4,5-dicarboxylates from Benzylic Chlorides and Acetylenedicarboxylates
作者:Taro Imai、Hideo Togo
DOI:10.1002/ejoc.201701726
日期:2018.3.22
N‐methylmorpholine N‐oxide (NMO) and then NH2OH·HCl and potassium carbonate followed by the addition of Oxone® in the presence of acetylene derivatives to give the corresponding 3‐arylisoxazole‐4,5‐dicarboxylates in good to moderate yields. This one‐pot transformation used readily available materials and was performed under transition‐metal‐free conditions.
A Facile One-Pot Synthesis of 3,5-Disubstituted Isoxazole Derivatives Using Hydroxy (Tosyloxy) Iodobenzene
作者:Ravindra D. Jadhav、Hitesh D. Mistry、Hashim Motiwala、Kishorkumar S. Kadam、Shivaji Kandre、Amol Gupte、Ashok K. Gangopadhyay、Rajiv Sharma
DOI:10.1002/jhet.1556
日期:2013.7
Hydroxy (tosyloxy) iodobenzene (HTIB), a hypervalent iodine reagent, has been extensively used for oxidative transformations. We have developed a one‐pot synthesis wherein aldoximes when reacted with alkynes in the presence of HTIB result in the direct formation of isoxazoles. This simple and straightforward reaction allows for ease of purification while leading to the formation of high purity 3,5‐disubstituted