Stable Antiaromatic 1,4-Diazapentalenes: Synthesis and Oxidation Reaction of 2-Vinyl- and 2,5-Divinyl-1,4-dihydropyrrolo[3,2-b]pyrrole Derivatives
摘要:
Stable and isolable 8 pi electrons antiaromatic compounds, 2-vinyl and 2,5-divinyl substituted 1,4-diazapentalenes were synthesized via an oxidation reaction of correspondingly substituted 1,4-dihydro-3, 6-di-tert-butylpyrro1o[3,2-b]pyrroles which were prepared by an electrophilic addtion reaction of dimethyl acetylenedicarboxylate (DMAD).
The reaction of 3,6-di-tert-butyl-1,4-dihydropyrrolo[3,2-b]pyrrole and its N,N'-dimethoxycarbonyl derivative with chlorosulfonyl isocyanate (CSI) was investigated. The higher reactivity for the electrophilic reaction and a remarkable electron excessiveness of the system were demonstrated by comparing with those of indole and pyrrole derivatives.
TANAKA, SHOJI;SATAKE, KYOSUKE;KIYOMINE, AKIRA;KUMAGAI, TSUTOMU;MUKAI, TOS+, ANGEW. CHEM., 100,(1988) N, C. 1134-1135