Complete assignment of1H and13C NMR data and establishment of the relative stereochemistry of C-1-functionalized 2,4-dimethyl-8-oxabicyclo[3.2.1] oct-6-en-3-one derivatives
作者:Angel M. Montaña、Pedro M. Grima、Francisca García
The total assignment of the 1H and 13C NMR spectra of 24 cis‐endo and 15 cis‐exo diastereoisomers of C‐1‐substituted 2,4‐dimethyl‐8‐oxabicyclo[3.2.1]oct‐6‐en‐3‐one derivatives was deduced from the concerted application of DEPT, COSY, HETCOR, HMBC, HMQC and PS‐NOESY experiments. The relative stereochemistry of major (cis‐endo) and minor (cis‐exo) diastereoisomers was established on the basis of correlation
alpha-Hetero-substituted Furans as Dienes in [4+3] Cycloadditions with 1,3-Dimethyloxyallyl Cation for the Preparation of New Versatile Cycloheptane Synthons: A Study of the Factors Controlling the Diastereoselectivity.
作者:Angel M. Montaña、Sandra Ribes、Pedro M. Grima、Francisca Garcia、Louisa Barré、Ole Hammerich、Inger Søtofte、Bengt Långström
DOI:10.3891/acta.chem.scand.52-0453
日期:——
[4+3] Cycloaddition reactions of 2-functionalized furans with 1,3-dimethyloxyallyl cation, afford versatile polyfunctionalized cycloheptane synthons. Increasing electron-donating properties and/or decreasing size of the substituent at C-2 of furan improves yield but decreases stereoselectivity. The opposite effect is also observed, so, by designing a bulky enough alpha-substituent it is possible to obtain endo stereospecificity. cis Stereospecificity is observed in all studied cases and it is probably determined by the type of reaction mechanism.