Gold-Catalyzed [4 + 1]-Annulation Reactions between 1,4-Diyn-3-ols and Isoxazoles To Construct a Pyrrole Core
摘要:
This work reports gold-catalyzed [4 + 1]-annulation reactions between 1,4-diyn-3-ols and isoxazoles or benzisoxazoles to yield pyrrole derivatives. The reaction chemoselectivity is controlled by an initial attack of an isoxazole at a less hindered alkyne to form gold carbenes, further inducing a 1,2-migration of a second alkyne group. A broad substrate scope of 1,4-diyn-3-ols, isoxazoles and even benzisoxazoles highlighted the reaction utility.
Abstract Polystyrene-supported vinyl sulfone reagent has been developed and used for solid-phase organic synthesis of 3-monosubstituted isoxazoles by 1,3-dipolar cycloaddition reaction with nitrile oxides and subsequent cleavage from the polymer support through an elimination reaction in the presence of potassium tert-butoxide. The advantages of this method include straightforward operation, good yield
Efficient and Regioselective One-Pot Synthesis of 3-Substituted and 3,5-Disubstituted Isoxazoles
作者:Shibing Tang、Jinmei He、Yongquan Sun、Liuer He、Xuegong She
DOI:10.1021/ol901626n
日期:2009.9.3
A series of 3-substituted and 3,5-disubstitutedisoxazoles have been efficiently synthesized in moderate to excellent yields by the reaction of N-hydroxyl-4-toluenesulfonamide with α,β-unsaturated aldehydes/ketones. This novel strategy is associated with readily available starting materials, mild conditions, high regioselectivity, and wide scope.
Efficient and Regioselective Synthesis of 5-Hydroxy-2-isoxazolines: Versatile Synthons for Isoxazoles, β-Lactams, and γ-Amino Alcohols
作者:Shibing Tang、Jinmei He、Yongquan Sun、Liuer He、Xuegong She
DOI:10.1021/jo1000065
日期:2010.3.19
An efficient and highly regioselective protocol was developed for the preparation of 5-hydroxy-2-isoxazolines, which have been proved to be versatile synthons for isoxazles, beta-hydroxy oximes, and gamma-amino alcohols. beta-Lactams, commonly embedded in the skeletons of bioactive natural products, were also synthesized in two steps from beta-hydroxy oximes, providing a new strategy for the synthesis of this kind of compounds.
US7470722B2
申请人:——
公开号:US7470722B2
公开(公告)日:2008-12-30
[EN] MULTICYCLIC SULFONAMIDE COMPOUNDS AS INHIBITORS OF HISTONE DEACETYLASE FOR THE TREATMENT OF DISEASE<br/>[FR] COMPOSES SULFONAMIDE MULTICYCLIQUES INHIBANT L'HISTONE DESACETYLASE POUR LE TRAITEMENT DE MALADIE
申请人:KALYPSYS INC
公开号:WO2005123089A2
公开(公告)日:2005-12-29
Disclosed herein are carbonyl compounds of Formula (I) as described herein. Methods and compositions are disclosed for treating disease states including, but not limited to cancers, autoimmune diseases, tissue damage, central nervous system disorders, neurodegenerative disorders, fibrosis, bone disorders, polyglutamine-repeat disorders, anemias, thalassemias, inflammatory conditions, cardiovascular conditions, and disorders in which angiogenesis play a role in pathogenesis, using the compounds of the invention. In addition, methods of modulating the activity of histone deacetylase (HDAC) are also disclosed.