Steric effects on the sydnones reactivity. New sydnones and pyrazoles
نویسندگان
چکیده
منابع مشابه
Synthesis of aminopyrazoles from sydnones and ynamides.
Aminopyrazoles are prepared from readily accessible sydnones and sulfonyl ynamides using either a copper-mediated sydnone alkyne cycloaddition (CuSAC) or in situ generated strained cyclic ynamides.
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New trans- and cis-o-stilbene-methylene-sydnones 3a,b were synthesized by transforming the trans- and cis-o-aminomethylstilbene derivative, obtained by reduction of corresponding o-cyano derivatives, into glycine ester derivatives (43 and 31% yield) followed by hydrolysis (90 and 96% yield), nitrosation and ring closure with acetic acid anhydride (30 and 40% yield). The products were submitted ...
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In the present work, suitably functionalized arylsydnones were used to synthesize a variety of 4-acyl-sydnones and diacyl sydnones, both as potential precursors to novel sydnoquinolines. The approach to the diacyl species is based on the discovery that activated sydnones brominate in both the 4 position of the sydnone ring and on the phenyl ring. Thus, it seemed likely that Friedel-Crafts react...
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In this work, suitably functionalized arylsydnones were used to synthesize ortho-alkynyl sydnones as precursors to functionalized sydnoquinolines. The versatile intermediates, 3-(4-halo-2-iodophenyl)sydnones and 3-(3-halo-2-iodophenyl)sydnones have been synthesized in moderate to good yield using a sequence involving dilithiation of 3-(4-halophenyl)-sydnones and 3-(3-halophenyl)sydnones using t...
متن کاملthe effects of planning on accuracy and complexity of iranian efl students’ written narrative task performance
this study compared the different effects of form-focused guided planning vs. meaning-focused guided planning on iranian pre-intermediate students’ task performance. the study lasted for three weeks and concentrated on eight english structures. forty five pre-intermediate iranian students were randomly assigned to three groups of guided planning focus-on-form group (gpfg), guided planning focus...
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ژورنال
عنوان ژورنال: Arkivoc
سال: 2002
ISSN: 1551-7012
DOI: 10.3998/ark.5550190.0003.209