Poly-oxygenated tricyclobutabenzenes via repeated [2 + 2] cycloaddition of benzyne and ketene silyl acetal.
Described herein is a synthesis of highly functionalized tricyclobutabenzenes, a class of molecules of structural and theoretical interest. The preparation is based on the repeated [2 + 2] cycloadditions of benzyne and ketene silyl acetals (KSAs), where two types of regioselectivity enable discrimination of the functionalities on the four-membered rings. By these steps, we were able to prepare poly-oxygenated octamethoxytricyclobutabenzene and its hydrolyzed tetra-oxo derivatives. Structural study on the latter compound showed the interesting properties related to the strained four-membered ring.
Hamura
Toshiyuki
T
Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8551, Japan.
Ibusuki
Yousuke
Y
Uekusa
Hidehiro
H
Matsumoto
Takashi
T
Suzuki
Keisuke
K