SYNTHESIS AND REACTIONS OF NEW FUSED HETEROCYCLES DERIVED FROM 3-(o-AMINOPHENYL)-4-AMINO-5-MERCAPTO-1,2,4-TRIAZOLE
作者:H. M. Moustafa
DOI:10.1081/scc-100000185
日期:2001.1
3-(o-Aminophenyl)-4-amino-5-methylthio-s-triazole 1 was used for the synthesis of some new fused heterocycles 2–6, 9 and spiro systems 7, 8. Diazotization of compound 10 led to the formation of compound 11. Alkylation of compound 11 with chloroacetonitrile gave compound 12. Heterocyclic systems 13–16, 18–20 and spiro compouds 17, 21 were prepared through the reaction of compound 12 with the appropriate
Cyclopropanation of electron-deficient alkenes and wideqvist-type synthesis of cyclopropanes mediated by indium metal
作者:Shuki Araki、Yasuo Butsugan
DOI:10.1039/c39890001286
日期:——
Cyclopropanation of electron-deficientalkenes and Wideqvist-type transformation of carbonyl compounds to cyclopropanes have been achieved by the action of active methylene dibromides and metallic indium.
Dibutyl telluride assists cyclopropanation of α,β-unsaturated ketone, ester, and nitrile with dibromomalonic esters without solvent at room temperature. In addition, it effects alkylidenation of aldehydes including α,β-unsaturated aldehyde with the same reagent.
Synthesis of Some New Heterocycles Derived from Arylmethylenemalononitriles
作者:A. M. El-Sayed、A. Khodairy
DOI:10.1080/00397919808004441
日期:1998.9
Abstract Arylmethylenemalononitriles 1 were treated with halo compounds under phase transfer catalysis (PTC) conditions to yield α-polyfunctional arylmethylene-malononitrile derivatives 2–4. The treatment of compounds 2–4 with hydrazine hydrate gave pyridinones 5,6 and pyridine 7, respectively. Triazines, triazepines, tetrazines, and triazoles 8–15 fused with pyridinone were synthesized by treating
Reactions des n-phtalimidyl et n-succinimidyl iminophosphoranes avec les composes a triple liaison; acetyleniques actives et α-halonitriles
作者:Pierre Merot、Claude Gadreau、André Foucaud
DOI:10.1016/s0040-4020(01)98962-8
日期:1981.1
acetylenic compounds 5 yield phosphoranes that spontaneously gives ring closure with one of the imidyl carbonyl groups. If this imidyl substituent is an unsymmetrically substituted succinimide, the carbonyl group with less steric hindrance undergoes cyclization. Phthalimidyliminophosphoranes react with some α-halonitriles (i) on the positive halogen if the nitrile group is stericallyhindered (halonitriles