نتایج جستجو برای: isoxazoles
تعداد نتایج: 437 فیلتر نتایج به سال:
The crystal structure of the title compound, C(17)H(16)N(2)O(3)S, exhibits intra-molecular C-H⋯S and inter-molecular C-H⋯S and C-H⋯O hydrogen bonds, C-S⋯N [S⋯N = 3.033 (2) Å and C-S⋯N = 142.76 (9)°] inter-actions, and C-H⋯π inter-actions; these inter-actions generate S(4), S(6) and R(2) (2)(14) ring motifs. The isoxazole ring adopts an envelope conformation, with the N atom displaced by 0.672 (...
A convenient and efficient [3 + 2] cycloaddition reaction of alkenes alkynes with the in situ generated nitrile oxides from aldoximes presence NaCl, Oxone Na2CO3 has been developed to afford a series isoxazoles isoxazolines at room temperature yields up 85% 86%, respectively. The current methodology exhibits wide substrate scope, (hetero)aromatic aliphatic aldoximes, including acrylate esters, ...
Introduction The 1,3-dipolar cycloaddition reactions of nitrile oxides formed in situ (in the presence of NCS and Et3N) from the oximes of (purin-9-yl)acetaldehyde or (coumarinyloxy)acetaldehyde with allyloxycoumarins or 9-allylpurines, respectively resulted in 3,5-disubstituted isoxazolines. The similar reactions of propargyloxycoumarins or 9-propargylpurines led to 3,5-disubstituted isoxazole...
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