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.
Dimethoxy[2.2]metacyclophane mainly gave a tetrahydropyrene structure and the other [2.n]metacyclophanederivatives (n=3–5) gave aromatic bromides like pseudo-ipso and/or pseudo-ortho dibromides in the reaction with bromine. They also gave benzyl bromides by cyclobutane ring-opening.
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.
Synthesis of three-bridged cyclophanes via meta- and ortho-cyclophane