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Spiro heterocyclization of 4-aryl-4-oxobutane-1,1,2,2-tetracarbonitriles to 3H-pyrrole derivatives, 2-oxa-7-azaspiro[4.4]nona-3,6,8-trienes

✍ Scribed by M. Yu. Belikov, O. V. Ershov, I. V. Lipovskaya…


Book ID
120771894
Publisher
SP MAIK Nauka/Interperiodica
Year
2013
Tongue
English
Weight
172 KB
Volume
49
Category
Article
ISSN
1070-4280

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## Abstract magnified image The reactive zwitterionic 1 : 1 intermediate **6** generated __in situ__ from the reaction between an isocyanide **2** and a dialkyl acetylenedicarboxylate (=dialkyl but‐2‐ynedioate) **3** was trapped by an __N__‐arylmaleimide or ‐phthalimide **4** to produce a highly f