Construction of multiring frameworks by metal-free cascade reactions of stable isochromenylium tetrafluoroborate.
Efficient methodologies for constructing several multiring frameworks have been developed utilizing the cascade reactions of air-stable isochromenylium tetrafluoroborates with olefins. Successive additions of two equivalents of styrene-type olefins to isochromenylium tetrafluoroborate (ICTB) 1 have been observed and their mechanisms were proposed and discussed. Intramolecular capture of the early stage cationic intermediates by predevised heteroatoms or Friedel-Crafts donors provided two different types of bridged-ring systems.
State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China.
Zhi-Long
ZL
Hu
Wen-Jian
WJ
Qian
Sheng
S
Wang
Shaozhong
S
Wang
Zhu-Jun
ZJ
Yao
D000475:Alkenes / Q000737:chemistry*; D001881:Borates / Q000737:chemistry*; D015394:Molecular Structure; D013343:Styrenes / Q000737:chemistry*
D000475:Alkenes; D001881:Borates; D013343:Styrenes; C546493:isochromenylium tetrafluoroborate