Superelectrophilic-Initiated C–H Functionalization at the β-Position of Thiophenes: A One-Pot Synthesis of <i>trans</i>-Stereospecific Saddle-Shaped Cyclic Compounds
Superelectrophilic-initiated direct C–H functionalization of thiophenes at the β-position was developed. A series of trans-stereospecific [2,1-a]-IF-thiophene-fused cyclic compounds (4) with saddle-shaped structure were prepared in 17–30% yields through a one-pot superelectrophilic Friedel–Crafts reaction of dihydroindenofluorene with thiophene derivatives. From the crystal packing analyses of 4a, its
Twisted Polycyclic Aromatic Hydrocarbon with a Cyclooctatetraene Core via Formal [4+4] Dimerization of Indenofluorene
作者:Yoshito Tobe、Shunpei Nobusue
DOI:10.1055/s-0035-1562361
日期:——
A polycyclic aromatic hydrocarbon having a twisted cyclooctatetraene (COT) core was prepared by a formal [4+4] dimerization of an in situ generated indeno[2,1-a]fluorene derivative. The compound consists of two indenofluorene frameworks connected with two double bonds and adopts a twisted geometry to avoid intramolecular steric repulsion. It exhibits a long-wavelength absorption band with a maximum