中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 6-tert-butyl-9,18-dihydroxy[3.3]metacyclophane | 1356194-35-8 | C22H28O2 | 324.463 |
—— | 6-ter-tbutyl-9,18-dimethoxy[3.3]metacyclophane-2,11-dione | 477254-90-3 | C24H28O4 | 380.484 |
1,3-双(溴甲基)-5-叔丁基-2-甲氧基苯 | 1,3-Bis(bromomethyl)-5-tert-butyl-2-methoxybenzene | 69403-15-2 | C13H18Br2O | 350.093 |
Various anti-9-methoxy[3.3]metacyclophane-2,11-diones are exclusively obtained by the coupling reaction of the corresponding 1,3-bis(bromomethyl)benzenes and 2,6-bis[2-isocyano-2-(tolylsulfonyl)ethyl]-4-tert-butylanisole in dimethylformamide (DMF) with an excess of sodium hydride, from which the corresponding syn-[3.3]metacyclophanes (MCPs) are synthesized via anti/syn-isomerization during the Wolff–Kishner reduction. Demethylation of syn-9-methoxy[3.3]MCPs with BBr3 afforded the corresponding syn-9-hydroxy[3.3]MCPs in good yields. The existence of the strong intramolecular hydrogen bonding between the 9-hydroxy group and the 18-substituents, such as F, OH, and OMe groups at the opposing aromatic rings, are observed in solution and in the solid state. A distinct low-field shift of the phenolic OH proton was observed in the 1H NMR spectrum compared with that of the 18-unsubstituted analog. Furthermore, O–H···F through-space coupling was observed.