Sequential Aminodiene Diels−Alder Approach to the Ergoline Skeleton
作者:Albert Padwa、Scott K. Bur、Hongjun Zhang
DOI:10.1021/jo0508797
日期:2005.8.1
diene. The presence of this activating group not only prevents the isomerization of the advanced ergoline intermediate to a naphthalene but can also be leveraged for an oxidation to provide Uhle's ketone (13). The easily formed Kornfeld ketone analogue 25 was readily transformed into the corresponding triflate 41 by the action of triflic anhydride and a base. Oxidative addition of vinyl triflate 41 to Pd(0)