作者:Shuji Kanemasa、Seiichi Nakamura、Shoji Kajigaeshi
DOI:10.1246/cl.1980.947
日期:1980.8.5
cyclo-addition reaction to acrylic derivatives under dehydrogenating conditions giving 2,3-dihydro-3-oxo[1,3]thiazino[4,3,2-cd]indolizines. These cycloadducts were converted into the thiacyclazines with twelve electrons on the perimeter via reduction and subsequent dehydration. NMR spectra of the thiacyclazines showed appreciable shielding relative to simple indolizine and cycl[3.2.2]azine.
外围的 azomethine ylid 1,3-dipole, anhydro 2,3-dihydro-3-oxo-4H-pyrido[2,1-b][1,3]thiazinium 氢氧化物,在脱氢下与丙烯酸衍生物发生环加成反应条件产生 2,3-dihydro-3-oxo[1,3]thiazino[4,3,2-cd]indolizine。这些环加合物通过还原和随后的脱水转化为周边有十二个电子的噻环嗪。相对于简单的吲哚嗪和环 [3.2.2] 嗪,噻环嗪的 NMR 谱显示出明显的屏蔽。