Synthesis and Computational Analysis of Densely Functionalized Triazoles Using <i>o</i>-Nitrophenylalkynes
作者:Melissa L. McIntosh、Ryne C. Johnston、Ommidala Pattawong、Bradley O. Ashburn、Michael R. Naffziger、Paul Ha-Yeon Cheong、Rich G. Carter
DOI:10.1021/jo202467k
日期:2012.1.20
Dipolar cylcoadditions with azides using a series of o-nitrophenylethynes and disubstituted alkynes were studied experimentally and computationally. Density functional theory computations reveal the steric and electronic parameters that control the regioselectivity of these cycloadditions. Several new substrates were predicted that would either give enhanced regiocontrol or invert the regiochemical preference. Experimentally, the alkynes were screened in the [3 + 2] cycloaddition with benzyl azide. Of the 11 alkynes screened experimentally, the acetylenes containing halogen substitution directly on the alkyne provided the highest levels of regioselectivity. These haloalkynes were also shown to tolerate variation of the azide moiety with continued good levels of regioselectivity in most cases. Diverse functional groups can be incorporated through the cycloaddition process and their subsequent orthogonal modification was demonstrated.
Diels−Alder Approach to Tetra-ortho-Substituted Biaryls Employing Propargylic Tertiary Alcohols as Dienophiles
作者:Bradley O. Ashburn、Rich G. Carter
DOI:10.1021/jo070812e
日期:2007.12.1
The efficient synthesis of a series of tetra-ortho-substituted biaryls is described utilizing a Diels-Alder reaction between propargylic tertiary alcohols and cyclic oxygenated dienes. The successful resolution of one of the biaryls is achieved through derivatization with menthyl chloroformate followed by crystallization. The menthyl carbamate is cleaved under basic conditions to reveal enantiomerically pure biaryl compounds.
[EN] METHOD FOR MAKING BIARYL COMPOUNDS, COMPOUNDS MADE BY THE METHOD, AND METHOD FOR THEIR USE<br/>[FR] PROCÉDÉ DE FABRICATION DE COMPOSÉS BIARYLES, COMPOSÉS OBTENUS PAR LE PROCÉDÉ ET LEUR PROCÉDÉ D'UTILISATION
申请人:OREGON STATE
公开号:WO2008156656A2
公开(公告)日:2008-12-24
[EN] Certain disclosed embodiments of the present invention concern a method for making biaryl compounds by combining a diene with a dienophile under reaction conditions that facilitate a Diels-Alder reaction. Certain embodiments are particularly directed to making a tetra-ortho-substituted biaryl compounds. The disclosed method may involve using novel dienes, dienophiles, or both. Similarly, certain of the biaryl compounds are novel compounds too. Additional disclosed embodiments concern a method for making useful compounds by first making a Diels-Alder adduct. The Diels-Alder adduct is then further modified or coupled to other compounds. The method can be used to make carbazoles, such as Siamenol. Disclosed biaryl compounds are useful for a number of applications, such as pharmacophores and organocatalysts. [FR] Certains modes de réalisation décrits de la présente invention concernent un procédé de fabrication de composés biaryles par combinaison d'un diène avec un diénophile dans des conditions réactionnelles qui facilitent une réaction de Diels-Alder. Certains modes de réalisation se rapportent particulièrement à la fabrication de composés biaryles tétra-ortho-substitués. Le procédé décrit peut mettre en jeu l'utilisation de nouveaux diènes, diénophiles ou les deux. De façon analogue, certains des composés biaryles sont également des composés nouveaux. Des modes de réalisation décrits supplémentaires concernent un procédé pour fabriquer de composés utiles en réalisant tout d'abord un produit d'addition de Diels-Alder. Le produit d'addition de Diels-Alder est ensuite à nouveau modifié ou couplé à d'autres composés. Le procédé peut être utilisé pour fabriquer des carbazoles, tels que le Siaménol. Les composés biaryles décrits sont utiles pour un nombre d'applications, telles que des pharmacophores et des organocatalyseurs.