diexo-2-Methylamino and 2-benzylamino-3-hydroxymethylbicyclo [2.2.1]heptanes and the corresponding bicycio [2.2.1] heptenes (5a -d, 7a -d) were synthesized from β-amino acid esters containing the norbornane or norbornene skeleton (3a-d). The aminoalcohols were converted to 5,8- methano -3,1-benzoxazines by reaction with formaldehyde. As established by 1H and 13C NMR spectroscopy, the predominant conformation
由包含降冰片烷或降冰片烯骨架(3a-d)。通过与甲醛反应将氨基醇转化为5,8-甲醇-3,1-苯并恶嗪。如1 H和13 C NMR光谱所确定的,主要构象是二叉基的内-船形(B),二叉基衍生物的是外-船形(E)。
Diversity‐oriented Functionalization of Cyclodienes Through Selective Cycloaddition/Ring‐opening/Cross‐metathesis Protocols; Transformation of a “Flatland” into Three‐dimensional Scaffolds With Stereo‐ and Regiocontrol
作者:Loránd Kiss、Zsanett Benke、Attila M. Remete、Ferenc Fülöp
DOI:10.1002/tcr.202000070
日期:2020.10
This article presents selective transformations of some readily available cyclodienes through simple chemical procedures into novel functionalized small‐molecular entities. The syntheses hereby described involved selective cycloadditions, followed by ring‐opening metathesis of the resulting β‐lactam or isoxazoline derivatives and selective cross‐metathesis by differentiation of the olefin bonds on