Photochromic Spirotetrahydroazafluorenes: Part IV. First Trapping of Novel Type of <i>cis</i>-Fixed Photochromes Based on Pyridazinopyrrolo[1,2-b]isoquinoline
作者:Saleh Abdel-Mgeed Ahmed
DOI:10.1080/15421400590946532
日期:2005.5.1
2a–g to diacetyl spirocyclopropene 1 in dry ether at − 20°C under nitrogen atmosphere for 3 h, which undergo ring opening the corresponding betaines 3′′′a–g through betaine 3′a–g and 3″a–g as intermediates after irradiation with UV-light. The serious decomposition of these products during purification process was moderately prevented by using flash chromatography after many trials. In situ hydrazinolysis
摘要 通过取代异喹啉衍生物 2a-g 与二乙酰螺环丙烯 1 在干燥醚中的亲核加成,在氮气氛下,在 - 20°C 3 小时,在用紫外线照射后,相应的甜菜碱 3'''a-g 通过甜菜碱 3'a-g 和 3''a-g 作为中间体进行开环。这些产物在纯化过程中的严重分解,经过多次试验,采用快速色谱法适度防止。在 - 40°C 下,THIs 3a-g 在乙醇中用肼原位肼解得到一种新型顺式固定的哒嗪基吡咯并 [1,2-b] 异喹啉 4a-g,产率适中。