Ni-Catalyzed Cross-Electrophile Coupling for the Synthesis of Skipped Polyenes
作者:Catherine P. McGeough、Alexandra E. Strom、Timothy F. Jamison
DOI:10.1021/acs.orglett.9b01019
日期:2019.5.17
Skipped polyenes featuring high ( E)-selectivity and varying methyl substitution patterns are synthesized using a nickel-catalyzed cross-coupling reaction between allyl trifluoroacetates and vinyl bromides. The utility of this cross-electrophile coupling is showcased in part by the synthesis of the RST fragment of the marine ladder polyether, maitotoxin. Construction of this fragment is particularly
A Scalable Route to Trisubstituted (<i>E</i>)-Vinyl Bromides
作者:Cheon-Gyu Cho、Won-Suk Kim、Amos B. Smith
DOI:10.1021/ol051376q
日期:2005.8.1
An effective, readily scalable two-step synthesis of trisubstituted (E)-vinyl bromides involving bromination of alpha,beta-unsaturated lactones followed by hydrolytic fragmentation has been developed. Several trisubstituted (E)-vinyl bromides, including multigram quantities of (+)-(E)-4-bromo-2-methyl-3-pentenol, a synthetic intermediate required for the C(8)-C(l 1) moieties of (+)-tedanolide (1) and (+)-13-deoxytedanolide (2), illustrate the utility of this protocol.