The Scope and Limitations of Intramolecular Nicholas and Pauson−Khand Reactions for the Synthesis of Tricyclic Oxygen- and Nitrogen-Containing Heterocycles
作者:Kristina D. Closser、Miriam M. Quintal、Kevin M. Shea
DOI:10.1021/jo8027592
日期:2009.5.15
scope and limitations of a tandem intramolecular Nicholas/Pauson−Khand strategy for the synthesis of tricyclic oxygen- and nitrogen-containing heterocycles. This methodology enables conversion of simple acyclic starting materials into a series of previously unknown heterocyclic architectures. For the preparation of cyclic ethers (Z = O), tricyclic [5,6,5]- through [5,9,5]-systems (m = 1, n = 1−4) are available
我们研究了用于合成三环含氧和氮的杂环的串联分子内Nicholas / Pauson-Khand策略的范围和局限性。这种方法可以将简单的非环状原料转化为一系列先前未知的杂环结构。对于制备环状醚(Z = O),可以使用三环[5,6,5]-到[5,9,5]-系统(m = 1,n = 1-4)和[5,7] ,5]-和[5,8,5]-系统可进行快速有效的合成。可以成功制备含三环[5,7,5]-和[5,8,5]-胺(Z = NTs)的杂环。尝试制造更大的环形系统(Z = O,m = 2; Z = O,n = 5;或Z = NTs,n= 4-5)或通过尼古拉斯与羧酸亲核试剂的反应制备内酯(可通过醇亲核试剂的氧化获得,Z = O)导致分解或二聚。当使用羧酸亲核试剂时,后一种方法能够形成14、16和18元环二醇。我们还研究了在Pauson-Khand步骤中使用手性胺启动子,但未发现不对称诱导。