Gold Catalysis: Efficient Synthesis and Structural Assignment of Jungianol andepi-Jungianol
作者:A. Stephen K. Hashmi、Li Ding、Jan W. Bats、Peter Fischer、Wolfgang Frey
DOI:10.1002/chem.200305092
日期:2003.9.22
Starting from 2-methylfuran and crotonaldehyde, both jungianol and epi-jungianol were prepared by a six-step sequence including a gold-catalyzed arene synthesis and a photochemical S(N)2-like reduction with lithium aluminum hydride. Not a single protective group was needed in the entire synthesis. With both diastereomers in hand, the stereochemical assignment in the literature could be corrected by
以2-甲基呋喃和巴豆醛为原料,通过六步法制备了jungianol和epi-jungianol,包括金催化的芳烃合成和氢化铝锂光化学还原S(N)2-样。在整个合成过程中不需要单个保护基。有了这两种非对映异构体,就可以通过彻底的(1)H NMR光谱分析和对表皮-jungianol衍生物的X射线衍射研究来纠正文献中的立体化学分配。