Reactions of triene-conjugated diazo-compounds: reaction paths from o-(1,3-dienyl)aryldiazomethanes to 3,8-methano-1,2-diazocines and to pyrrolo[2,1-a]phthalazines via intramolecular (3 + 2) and 1,1-cycloaddition reactions
作者:John T. Sharp、Paul Wilson、Simon Parsons、Robert O. Gould
DOI:10.1039/a909516k
日期:——
The reaction paths followed by the triene-conjugated diazo-compounds 7, which have α,β aromatic and γ,δ; ε,ζ olefinic unsaturation, depend strongly on the nature of the substituents R1 and R2. Those with R1,R2 = (CH2)3, 7a–e, react at room temperature via an intramolecular (3 + 2) cycloaddition reaction of unprecedented regioselectivity to give the bridged benzodiazocines 18a–e in high yield. Those with R1 = Me and R2 = Ph, 7f and 7g, react at 80 °C to give the hydrocarbons 19f,g and, via new chemistry, the pyrrolo[2,1-a]phthalazines 24f,g. The structures of compounds 18a, 19a and 24f have been determined by X-ray crystallography.
三烯并联二氮化合物7的反应途径,具有α,β芳香和γ,δ;ε,ζ烯烃不饱和键,强烈依赖于取代基R1和R2的性质。当R1,R2 = (CH2)3时,7a–e在室温下通过前所未有的区域选择性分子内(3 + 2)环加成反应,高产率地生成桥连的苯并二氮杂环18a–e。而当R1 = Me, R2 = Ph时,7f和7g在80°C下反应生成碳氢化合物19f,g,并通过新的化学途径生成吡咯[2,1-a]并菲啶24f,g。化合物18a, 19a和24f的结构已通过X射线晶体学确定。