A new entry to [6](1,4)naphthalenophane and [6](1,4)anthracenophane: Synthesis of peri-substituted derivatives
作者:Yoshito Tobe、Shinji Saiki、Koichiro Naemura
DOI:10.1016/0040-4039(94)02378-o
日期:1995.2
[6](1,4)Naphthalenophane (1a), [6](1,4)anthraceniophane (2a), and the perisubstituted derivatives 1b, 1c, and 2b were prepared by the benzoannelation method. The conformationalbehavior of 1b, 1c, and 2b suggests that their bridged aromatic rings are more distorted than those of the parent systems 1a and 2a.
The first total syntheses and structural studies of [6] (1,4) naphthalenophane (4) and [6] (1,4) anthracenophane (5), the smallest-bridged isolable cyclophanes with bentacene nuclei, are disclosed. The acenophanes 4 and 5 were successfully synthesized by the oxidative decarboxylation of benzo- and naphtho-fused propellenecarboxylic acids: the bridgehead olefins followed by subsequent treatment with
The unusual reactivity of [6](1,4)naphthalenophane (2) and [6](1,4)anthracenophane (3), the smallest-bridged acenophanes hitherto known, in electrophilic reactions has been disclosed. These reactions include (i) acid-catalyzed telomerization, (ii) peracid oxidation, and (iii) addition with dienophiles. Semi-empirical molecular orbital calculations (MNDO and MNDO/PM3) were performed in order to compare
[6](1,4)Naphthalenophane (1) and [6](1,4)anthracenophane (2) underwent thermal cycloaddition with tetracyanoethylene to give the corresponding [2+2] adducts 3 and 4. Anthracenophane 2 reacted with dimethyl acetylenedicarboxylate to yield the 1:1 and 1:2 adducts 6 and 7.
Telomers of bent arenes. Acid-catalyzed dimerization and trimerization of the 1,4-hexamethylene-bridged arenes [6]paracyclophane, [6](1,4)naphthalenophane, and [6](1,4)anthracenophane
Whereas treatment of 1,4-hexamethylene-bridged benzene [6]paracyclophane (1) with a catalytic amount of H2SO4 gave, as a minor product, dimer 6, along with isomers 4 and 5, similar treatment of 1,4-hexamethylene-bridged naphthalene [6](1,4)naphthalenophane (2) afforded predominantly dimers 7 and 8, together with trimers 9 and 10. The 1,4-hexamethylene-bridged anthracene [6](1,4)thracenophane (3) yielded only trimers 13 and 14.