Bergman cycloaromatization of imidazole-fused enediynes: the remarkable effect of N-aryl substitution
作者:Zhengrong Zhao、Yunshan Peng、N.Kent Dalley、John F Cannon、Matt A Peterson
DOI:10.1016/j.tetlet.2004.02.152
日期:2004.4
A series of N-arylsubstituted `imidazole-fused' (Z) 3-ene-1,5-diynes was prepared and kinetic parameters for their Bergman cycloaromatization reactivities were determined. N-Arylation enhanced rates relative to N-alkyl derivatives by up to sevenfold (ANOVA p<0.0001). The greatest enhancement was exhibited by the N-phenyl derivative (sevenfold at 145 °C).
制备了一系列的N-芳基取代的“咪唑稠合的”(Z)3-烯-1,5-二炔,并确定了其Bergman环芳化反应活性的动力学参数。N-芳基化相对于N-烷基衍生物的速率提高了七倍(ANOVA p <0.0001)。N-苯基衍生物表现出最大的增强作用(在145°C时为七倍)。
Photoinduced Bergman cycloaromatization of imidazole-fused enediynes
作者:Zhengrong Zhao、Justin G. Peacock、Daniel A. Gubler、Matt A. Peterson
DOI:10.1016/j.tetlet.2004.12.136
日期:2005.2
imidazole-fused’ enediynes—were synthesized and their reactivities in photoinduced Bergmancycloaromatizationreactions were determined. The more conformationally rigid analogues gave cycloaromatized products in good yields upon irradiation (450 W low-pressure mercury lamp, ambient temperature). A bicyclic analogue (3) was shown to cleave supercoiled plasmid DNA.