Arylazide Cycloaddition to Methyl Propiolate: DFT-Based Quantitative Prediction of Regioselectivity
作者:Giorgio Molteni、Alessandro Ponti
DOI:10.1002/chem.200204681
日期:2003.6.16
3-triazoles have been synthesized by 1,3-dipolar cycloaddition of the corresponding arylazides to methylpropiolate in carbon tetrachloride. The regioselectivity of these reactions cannot be rationalized on the basis of the electronic demands of the reactants or frontier molecular-orbital theory. Therefore, we applied to this problem a quantitative formulation of the HSAB principle to this problem
Copper Acetate Catalyzed Regioselective Synthesis of Substituted 1,2,3-Triazoles: A Versatile Azide-Alkene Cycloaddition/Oxidation Approach
作者:Sandeep Rohilla、Shyam Sunder Patel、Nidhi Jain
DOI:10.1002/ejoc.201501301
日期:2016.2
A copperacetatecatalyzedoxidativecycloaddition reaction of benzyl and aryl azides with terminal and internal olefins that contain electron-withdrawing groups (COOR, CONH2, CN, CHO, COR) has been developed. The reaction employs air as the oxidant and does not require any base or additives to afford 1,4-disubstituted and 1,4,5-trisubstituted 1,2,3-triazoles in good to excellent yields with high regioselectivity
Aryliminopropadienone−<i>C</i>-Amidoketenimine− Amidinoketene−2-Aminoquinolone Cascades and the Ynamine−Isocyanate Reaction
作者:Curt Wentrup、V. V. Ramana Rao、Wilhelm Frank、Belinda E. Fulloon、Daniel W. J. Moloney、Thomas Mosandl
DOI:10.1021/jo982471y
日期:1999.5.1
and triazole 19 and are observed by IR spectroscopy. Ketenimine-3-carboxylic acid esters 12a are isolable at room temperature. Ketenes 11 and ketenimines 12 undergo rapid interconversion in the gasphase, and the ketenes cyclize to 4-quinolones 13. When using an amine leaving group in Meldrum's acid derivatives 9c, the major reaction products are aryliminopropadienones, ArN=C=C=C=O (15). The latter
亚胺基酮烯11和氧杂环丁酮12是通过快速真空热解Meldrum的酸衍生物9,吡咯二酮17和18以及三唑19生成的,并通过红外光谱进行观察。Ketenimine-3-羧酸酯12a在室温下是可分离的。酮基11和酮亚胺12在气相中快速转变,并且酮烯环化为4-喹诺酮13。当在Meldrum的酸衍生物9c中使用胺离去基团时,主要反应产物是芳基丙二烯酮,ArN = C = C = C = O(15)。后者与1当量的亲核试剂反应生成酮亚胺12,并与2当量的反应生成丙二酰亚胺衍生物16.N-芳基酮亚胺-C-羧酰胺12c在25-40℃的温度下通过瞬态a基11c环化为喹诺酮13c。这意味着即使在室温下,烯酮和酮亚胺也可以通过二甲氨基的1,3-移位而快速相互转化。这种相互转换解释了先前对乙胺异氰酸酯反应的结果了解甚少。讨论了4-喹诺酮/ 4-喹啉醇互变异构的溶剂依赖性。NMe(2)小组在酰胺基亚胺12c和丙二酰胺和am
‘Click’ Chemistry on Sugar-Derived Alkynes: A Tandem ‘Click-Click’ Approach to Bistriazoles
Development of a tandem ‘click-click’ approach to the formation of successive 1,4-disubstituted 1,2,3-triazole linkages and ‘click chemistry’ on sugar-derived alkynes are described.
Kinetics and mechanism of the 1,3-dipolar cycloaddition of phenyl azides to methyl 3-pyrrolidinoacrylate
作者:Basil H. Al-Sader、Mohamed Kadri
DOI:10.1016/s0040-4039(00)98779-3
日期:1985.1
Kinetics of cycloadditions of phenyl azides to methyl 3-pyrrolidinoacrylate (2) produced Hammett ϱ = 2.2. An Ea of 13.5 kcal mole −1 and Δ S* of −37.4 cal.K−l mole−1 were calculated for the cycloaddition of p-O2NC6H4N3 to 2. The cycloadditions are concerted, non-synchronous, and are controlled by LUMO (azide) - HOMO (dipolarophile) interactions.
苯叠氮化物与3-吡咯烷基丙烯酸甲酯(2)的环加成反应动力学为Hammett ϱ = 2.2。计算出pO 2 NC 6 H 4 N 3至2的环加成反应的E a为13.5 kcal摩尔-1,ΔS *为-37.4 cal.K -1摩尔-1。并受LUMO(叠氮化物)-HOMO(双极亲和性)相互作用的控制。