gel-supported sodium hydrogen sulfate (NaHSO4/SiO2) or Amberlyst 15 as solid acid catalyst, and then the corresponding 3-acylisoxaszoles were obtained by reacting with alkynes via the 1,3-dipolar [3+2] cycloaddition. These heterogeneous catalysts are easily separable from the reaction mixture and reused. This synthetic method provides a facile, efficient, and reusable production of 3-acylisoxazoles.
(Isoxazol-3-yl)arylmethanones, a process for their preparation and their use as medicaments
申请人:——
公开号:EP0189771A3
公开(公告)日:1986-10-08
There are disclosed novel compounds having the
formula where each X is independently hydrogen, halogen - (F, Cl, Br or I), loweralkyl or loweralkoxy; m is 1 or 2; R' is hydrogen or loweralkyl; and R is
t, 2 or 3, each of R, and R2 being independently hydrogen or loweralkyl and R3 beingan optical antipode thereof or a pharmaceutically acceptable acid addition salt thereof, which are useful as antihypertensive, analgesic and antiinflammatory agents, methods for synthesizing them, and pharmaceutical compositions comprising an effective amount of such a compound.
(Isoxazol-3-yl)arylmethanones, compositions and pharmaceutical use
申请人:Hoechst-Roussel Pharmaceuticals Inc.
公开号:US04562187A1
公开(公告)日:1985-12-31
There are disclosed novel compounds having the formula ##STR1## where each X is independently hydrogen, halogen (F, Cl, Br or I), loweralkyl or loweralkoxy; m is 1 or 2; R' is hydrogen or loweralkyl; and R is ##STR2## n being 1, 2 or 3, each of R.sub.1 and R.sub.2 being independently hydrogen or loweralkyl and R.sub.3 being ##STR3## an optical antipode thereof or a pharmaceutically acceptable acid addition salt thereof, which are useful as antihypertensive, analgesic and antiinflammatory agents, methods for synthesizing them, and pharmaceutical compositions comprising an effective amount of such a compound.
Does electrophilic activation of nitroalkanes in polyphosphoric acid involve formation of nitrile oxides?
作者:Alexander V. Aksenov、Nicolai A. Aksenov、Nikita K. Kirilov、Anton A. Skomorokhov、Dmitrii A. Aksenov、Igor A. Kurenkov、Elena A. Sorokina、Mezvah A. Nobi、Michael Rubin
DOI:10.1039/d1ra06503c
日期:——
The mechanistic rationale involving activation of nitroalkanes towards interaction with nucleophilic reagents in the presence of polyphosphoricacid (PPA) was re-evaluated. Could nitrile oxide moieties be formed during this process? This experiment demonstrates that at least in some cases this could happen, as generated nitrile oxides were successfully intercepted as adducts of [3 + 2] cycloadditions