New Route to the Ergoline Skeleton via Cyclization of 4-Unsubstituted Indoles
作者:Scott D. Burley、Vicky V. Lam、Frederick J. Lakner、B. Mikael Bergdahl、Matthew A. Parker
DOI:10.1021/ol400620a
日期:2013.6.7
A newroute to the ergoline skeleton has been developed that does not require prior functionalization of the indole 4-position. The indole nucleus is introduced late in the synthesis to allow for eventual efficient introduction of substituents in this region. Key steps include Negishi coupling of a three-carbon chain to a bromonicotinate ester, Fischer indole synthesis to facilitate incorporation of