Dimethoxy[2.n]metacyclophanes were obtained in 46–68% yields through [2 + 2] photocycloaddition of corresponding styrene derivatives. These metacyclophanes were assigned to be of syn-conformation (n = 3, 4, 5, and 6) or the mixture of syn- and anti-conformers with the syn/anti ratio of 4/3 (n = 2).
Chloromethylation of syn -[2. n ]metacyclophanes and application toward multi-bridged cyclophane synthesis
作者:Yukihiro Okada、Masatoshi Kaneko、Jun Nishimura
DOI:10.1016/s0040-4039(00)01868-2
日期:2001.1
Dimethoxy[2.n]metacyclophanes (n=3–5) gave the pseudo-ipso or pseudo-ortho products of dichlorides by chloromethylation. Dichlorides were converted to furnish multi-bridged cyclophanes by changing the chloromethyl group to a vinyl group.
The formylation of syn-[2.n]metacyclophanes and application to multi-bridged cyclophane synthesis
作者:Yukihiro Okada、Masatoshi Kaneko、Jun Nishimura
DOI:10.1016/s0040-4039(01)00021-1
日期:2001.3
Dimethoxy[2.n]metacyclophanes (n=2-5) were formylated to produce pseudo-ipso and/or pseudo-ortho dialdehydes. The formyl group was transformed to a cinnamyl group to furnish multi-bridged cyclophanes. (C) 2001 Elsevier Science Ltd. All rights reserved.