Selective preparation. 30. A convenient preparation of 5,13-di-tert-butyl-8,16-disubstituted-[2.2]metacyclophanes and their trans-tert-butylation and halogenation reactions
substituted [2.2]metaparacyclophanes using sulfur method and the X-ray structure determination of 4,5,6,8,12,13,15,16-octamethyl[2.2]metaparacyclophane are described. AlCl3-MeNO2-catalysed trans-tert-butylation of 5-tert-butyl-8,12,13,15,16-pentamethyl[2.2]metaparacyclophane in benzene led to isomerisation reaction to afford the strainless 8,12,13,14,16-pentamethyl[2.2]metacyclophane in 85% yield along
Synthesis of 1,2,9,10-tetrahydroxy[2.2]metacyclophanes via pinacol coupling reaction of 1,3-benzenedicarboxyaldehydes
作者:Daniel A Sahade、Ken-ichi Tsukamoto、Thies Thiemann、Tsuyoshi Sawada、Shuntaro Mataka
DOI:10.1016/s0040-4020(99)00055-1
日期:1999.2
Tetrahydroxy[2.2]metacyclophanes are formed via the aluminium mediated pinacol coupling reaction of 1,3-benzenedicarboxaldehydes. The results indicate that the presence of functional groups in the aromatic ring of the dialdehydes plays an important role in the formation of the cyclophane structure. Intramolecular coupling reactions as well as a comparison of different reductive systems are discussed