作者:Michael Gurry、Patrick McArdle、Fawaz Aldabbagh
DOI:10.3390/molecules200813864
日期:——
A new synthesis of 2-oxa-7-azaspiro[3.5]nonane is described. Spirocyclic oxetanes, including 2-oxa-6-azaspiro[3.3]heptane were converted into o-cycloalkylaminoacetanilides for oxidative cyclizations using Oxone® in formic acid. The expanded spirocyclic oxetane successfully gave the [1,2-a] ring-fused benzimidazole. X-ray crystal structure of the resultant new tetracyclic system, 1ʹ,2ʹ-dihydro-4ʹH-spiro[oxetane-3,3ʹ-pyrido[1,2-a]benzimidazole] and the azetidine ring-opened adduct, N-(2-acetamido-4-bromophenyl)-N-[3-(chloromethyl) oxetan-3-yl]methyl}acetamide are disclosed.
介绍了 2-oxa-7-azaspiro[3.5]nonane 的新合成方法。使用 Oxone® 在甲酸中将包括 2-oxa-6-azaspiro[3.3]heptane 在内的螺环氧杂环丁烷转化为邻环烷基氨基乙酰苯胺进行氧化环化。扩大的螺环 oxetane 成功地得到了[1,2-a] 环融合的苯并咪唑。由此产生的新四环系统 1ʹ,2ʹ-二氢-4ʹH-螺[氧杂环丁烷-3,3ʹ-吡啶并[1、2-a]苯并咪唑]和氮杂环丁烷开环加合物 N-(2-乙酰氨基-4-溴苯基)-N-[3-(氯甲基)氧杂环丁烷-3-基]甲基}乙酰胺。