1,2-Oxazol derivatives 3 were prepared by a highly regioselective 1,3-dipolar cycloaddition of nitrileoxides and α,β-acetylenicaldehydes 1 in good yields. Reactive nitrileoxides were generated in situ from stable chloro-oxime reagents 2 and triethyl amine. The cycloaddition reaction showed broad substrate scope and good functional group compatibility.
Copper-doped silica cuprous sulfate (CDSCS) as a highly efficient heterogeneous nano catalyst for synthesis of 3,5-disubstituted isoxazoles
作者:M. N. Soltani Rad、S. Behrouz、M. A. Faghihi
DOI:10.1007/s13738-013-0307-4
日期:2014.4
A facile and highly efficient protocol for 1,3-dipolar cycloaddition of in situ generated nitrile oxides with terminal alkynes catalyzed by copper-doped silica cuprous sulfate (CDSCS) as a new and convenient heterogeneous nano catalyst is described. In this protocol, ‘click’ cycloaddition of various structurally diverse alkynes and imidoyl chlorides in the presence of CDSCS and NaHCO3 in a solution of i-PrOH/H2O (1:1, V/V) furnishes the corresponding 3,5-disubstituted isoxazoles in good to excellent yields at room temperature. CDSCS was approved as a chemically and thermally stable nano catalyst that can be recovered and reused for many consecutive trials without considerable decline in its reactivity.
The preparation of optically active Δ2-isoxazolines via addition of nitrile oxides to chiral acryloyl esters bearing cyclitols as auxiliaries
作者:Takahiko Akiyama、Kohji Okada、Shoichiro Ozaki
DOI:10.1016/0040-4039(92)89026-9
日期:1992.9
An acryloyl ester derived from (1L)3-t-butyldiphenylsilyl-1,2:5,6-di-O-cyclohexylidene -chiro-inositol underwent 1, 3-dipolar cycloaddition with nitrile oxide to give Δ2-isoxazolines of high diastereomeric excess (up to 90% de).
The invention relates to compounds of Formula (I) and their use in therapy, for example in the treatment of mycobacterial infections or in the treatment of diseases caused by mycobacterium, such as tuberculosis.