Alkyne−Co<sub>2</sub>(CO)<sub>6</sub> Complexes in the Synthesis of Fused Tricyclic β-Lactam and Azetidine Systems<sup>,</sup><sup>1</sup>
作者:Benito Alcaide、Concepción Polanco、Miguel A. Sierra
DOI:10.1021/jo980114h
日期:1998.10.1
3a to form tricyclic systems. In fact, the analogous enyne-azetidines 20a,b smoothly cyclized to form the corresponding tricyclic systems. This approach to tricyclic azetidines was extended to prepare different products. A new, unprecedented, N1-C2 bond breakage was also observed in the azetidine ring. The results described show that the P-K reaction is a suitable approach to tricyclic 2-azetidinones
外消旋和对映体纯,稠合的三环2-氮杂环丁酮和氮杂环丁烷的合成方法已经开发出来,方法是在单环烯炔-β-内酰胺上使用Pauson-Khand(PK)反应作为关键的合成步骤。通过烯炔亚胺8和9与D-甘油醛亚胺10和(苄氧基)-或苯氧基乙酰氯的Staüdinger反应,可获得环化前体单环β-内酰胺1-7。烯炔亚胺8和9形成具有所需烯炔部分的顺式-2-氮杂环丁酮1和2。获得顺式-2-氮杂环丁酮11为单一非对映异构体,并通过标准方法将其转化为烯炔-2-氮杂环丁酮3和5。或者,通过对茴香基乙二醛二亚胺和(苄氧基)乙酰氯的环化反应制备4-甲酰基-2-氮杂环丁烷酮14,并通过标准反应将其转化为外消旋烯炔-β-内酰胺4和6。Enyne-2-azetidinones 1-7与Co(2)(CO)(8)反应以定量产生相应的炔烃-Co(2)(CO)(6)复合物。这种配合物与不同的促进剂,特别是热和TMANO的反应,形