H. Kigoshi et al., SYNTHETIC STUDIES ON APLYRONINE-A, A POTENT ANTITUMOR SUBSTANCE OF MURINE ORIGIN - STEREOCONTROLLED SYNTHESIS OF THE C21-C34 SEGMENT, Tetrahedron letters, 35(8), 1994, pp. 1247-1250
The C21-C34 segment 2 of aplyronine A (1), a potent antitumor substanc
e of marine origin, was synthesized enantioselectively in 25 steps (17
% overall yield) from imide 11.