Construction of the Benzindenoazepine Skeleton via Cyclopentannulation of Fischer Aminocarbene Complexes: Total Synthesis of Bulgaramine
作者:Matthew W. Giese、William H. Moser
DOI:10.1021/jo050631h
日期:2005.8.1
examples of this reaction type. The reaction solvent was a critical factor in the cyclopentannulation reaction, with measurable amounts of the desired product observed only when THF was utilized. The product yield could be further enhanced by the addition of two-electron donor ligands, demonstrating the first example of this effect on the thermal reaction of aminocarbene complexes with alkynes.
从商业上可获得的3,4-二甲氧基苯乙醇,以八步的最长线性序列完成了保加利亚香精的总合成,总产率为23%。Fischer氨基卡宾配合物的分子内环戊五环反应提供了关键步骤,并且比该反应类型的其他报道的实例在温和的条件下以更高的收率进行了反应。反应溶剂是环戊烯化反应中的关键因素,只有当使用THF时才能观察到可测量量的所需产物。通过添加双电子给体配体可以进一步提高产物收率,这证明了这种影响氨基卡宾络合物与炔烃热反应的第一个例子。