Ring transformation of cyclohepta[b]pyrimido[5,4-d]furan-8(7H),10(9H)-dionylium ion to the corresponding pyrrole derivatives via troponeimine intermediates: photo-induced autorecycling oxidizing reactions of some amines
作者:Shin-ichi Naya、Makoto Nitta
DOI:10.1016/j.tet.2004.07.063
日期:2004.10
troponeimine intermediates. Furthermore, novel photo-induced oxidation reactions of a series of 4+·BF4−, 5+·BF4−, and 6a,e+·BF4− towards some amines under aerobic conditions were carried out to give the corresponding imines in 455–8362% yields [based on compounds 4+, 5+, and 6a,e+], suggesting the oxidation reaction occurs in an autorecycling process. Mechanistic aspects of the amine-oxidation reaction are also
7,9- dimethylcyclohepta [环转化b ]嘧啶并[5,4- d ]呋喃8(7 ħ),10(9 ħ)-dionylium四氟硼酸盐4 + · BF 4 -到-7,9- dimethylcyclohepta [ b ]嘧啶并[5,4- d ] pyrrrole-8(7 ħ),10(9 ħ)-dionylium四氟硼酸6A - d + · BF 4 -由反应4 + · BF 4 -与胺和随后的交换使用aq的抗衡离子。HBF4。的反应4 + · BF 4 -与得到相应的吡咯衍生物苯胺和4-位取代的苯胺6A - C ^ + · BF 4 -直接在良好的产率。的,另一方面,反应4 + · BF 4 -与苄胺,得到中间体troponeimine 9,这是不转化成6D + · BF 4 -和收归4 + · BF 4 -通过加入HBF4 ; 然而,它被转换到图6d + · BF 4 -与(氯化钴)处理后2或的SOCl