Preparation of 6-, 7-, and 8-substituted derivatives of 2-Oxa-1,3,4,10-tetraazacyclopenta[<i>b</i>]fluoren-9-one
作者:Larry D. Bratton、Paul C. Unangst、J. Ronald Rubin、Bharat K. Trivedi
DOI:10.1002/jhet.5570380514
日期:2001.9
The preparation of a variety of derivatives of 2-oxa-1,3,4,10-tetraazacyclopenta[b]fluoren-9-one 1 is described. A series of substituted indan-1-ones were prepared and oxidized with N-bromosuccinimide and dimethyl sulfoxide to the corresponding ninhydrin derivatives. Cyclization of the ninhydrins with furazan-3,4-diamine yielded the target tetracycles. Appropiate choice of substituents in ninhydrins
描述了2-oxa-1,3,4,10-四氮杂环戊[ b ]芴-9-one 1的各种衍生物的制备。制备了一系列取代的茚满-1-酮,并用N-溴琥珀酰亚胺和二甲基亚砜氧化为相应的茚三酮衍生物。茚三酮与呋喃赞3,4-二胺的环化反应产生目标四环。在导致在目标tetracycles一种区域异构体的偏好ninhydrins取代基的Appropiate选择。这允许合成多种8-取代的杂环。在可能形成异构体的情况下,通过X射线晶体学确认了结构分配。