已经开发了一种新的合成喹唑啉的有效方法。因此,将N- [2-(1-(叠氮基烷基)苯基]甲酰胺1与POCl 3脱水,得到相应的2-(1-叠氮基烷基)苯基异氰酸酯2,然后将其在DMF中于0H下用NaH处理,得到喹唑啉。6通过环化1-(2-异氰基苯基)亚烷基亚胺中间体4得到满意的收率。该方法可用于喹唑啉的7-氮杂类似物的合成,即吡啶并[3,4- d ]嘧啶9。
已经开发了一种新的合成喹唑啉的有效方法。因此,将N- [2-(1-(叠氮基烷基)苯基]甲酰胺1与POCl 3脱水,得到相应的2-(1-叠氮基烷基)苯基异氰酸酯2,然后将其在DMF中于0H下用NaH处理,得到喹唑啉。6通过环化1-(2-异氰基苯基)亚烷基亚胺中间体4得到满意的收率。该方法可用于喹唑啉的7-氮杂类似物的合成,即吡啶并[3,4- d ]嘧啶9。
Mn-mediated oxidative radical cyclization of 2-(azidomethyl)phenyl isocyanides with carbazate: access to quinazoline-2-carboxylates
作者:Gujjenahalli Ramalingaiah Yogesh Kumar、Noor Shahina Begum、Khan Mohammed Imran
DOI:10.1039/d0nj00479k
日期:——
Mn-TBHP mediated oxidative radicalcyclization of 2-(azidomethyl)phenyl isocyanides using methyl carbazate has been described. This procedure is realized through a cascade radical addition and aromatization process with high atom economy to furnish various heterocyclic C2 diversified quinazoline-2-carboxylate derivatives.
efficient Mn(III)-mediated oxidative radical cascade reaction of 1-(azidomethyl)-2-isocyanoarenes with organoboronic acids is reported. The single electron oxidation of a commercially available organo boronic acid in the presence of a mild oxidant, Mn(OAc)3·2H2O, resulted in moderate yields of the corresponding quinazoline derivatives.
light-mediated facile synthesis of heteroarenes, namely, isoquinolines, benzothiazoles, and quinazolines, is demonstrated by employing isocyanides and inexpensive acyl peroxides. It is shown for the first time that singlet-excited isocyanides decompose acyl peroxides into aryl/alkyl radicals. The latter attack isocyanides, yielding imidoyl radicals that subsequently cyclize to afford heteroarene products. The