Ring-closing metathesis of α-ester-substituted enol ethers: application to the shortest synthesis of KDO
摘要:
Ring-closing metathesis reactions of alpha-ester-substituted enol ethers are described. In the case of unsubstituted terminal olefins, isomerization prior to cyclization was observed as an undesired side reaction, which could not be completely inhibited. Furthermore, this methodology was applied to a formal synthesis of KDO, which now represents the shortest synthetic pathway to KDO and its deoxy analogue. Interestingly, in this route olefin isomerization was not observed, presumably due to the increased steric environment of the double bond. Finally, an efficient two-step conversion to transform an alcohol into an alpha-alkoxy acrylate is also described. (C) 2003 Elsevier Ltd. All rights reserved.
Ring-closing metathesis of α-ester-substituted enol ethers: application to the shortest synthesis of KDO
摘要:
Ring-closing metathesis reactions of alpha-ester-substituted enol ethers are described. In the case of unsubstituted terminal olefins, isomerization prior to cyclization was observed as an undesired side reaction, which could not be completely inhibited. Furthermore, this methodology was applied to a formal synthesis of KDO, which now represents the shortest synthetic pathway to KDO and its deoxy analogue. Interestingly, in this route olefin isomerization was not observed, presumably due to the increased steric environment of the double bond. Finally, an efficient two-step conversion to transform an alcohol into an alpha-alkoxy acrylate is also described. (C) 2003 Elsevier Ltd. All rights reserved.
In accordance with the present invention, there are provided novel coupling agents which are compatible with a wide variety of adhesive formulations and which provide substantial adhesion enhancement relative to base formulations to which they are added. Invention compounds comprise at least one free-radically polymerizable group (other than acrylate) and at least one reactive moiety which forms covalent bond(s) with substrates having free hydroxyl groups on the surface thereof. Thus, invention compounds are covalently linked to adhesive formulations upon free radical cure, while at the same time providing “residual” functionality which is capable of undergoing reaction with any substrate having reactive (e.g., hydroxyl) groups in the surface thereof.
Ring-closing metathesis of α-ester-substituted enol ethers: application to the shortest synthesis of KDO
作者:Koen F.W Hekking、Floris L van Delft、Floris P.J.T Rutjes
DOI:10.1016/s0040-4020(03)00819-6
日期:2003.8
Ring-closing metathesis reactions of alpha-ester-substituted enol ethers are described. In the case of unsubstituted terminal olefins, isomerization prior to cyclization was observed as an undesired side reaction, which could not be completely inhibited. Furthermore, this methodology was applied to a formal synthesis of KDO, which now represents the shortest synthetic pathway to KDO and its deoxy analogue. Interestingly, in this route olefin isomerization was not observed, presumably due to the increased steric environment of the double bond. Finally, an efficient two-step conversion to transform an alcohol into an alpha-alkoxy acrylate is also described. (C) 2003 Elsevier Ltd. All rights reserved.