The resolved piperidinecarboxylate (R)-7 was converted to siastatin B (1) by an efficient and stereoselective sequence that includes a bromo-beta -lactonization and an N-acyliminium azidation. Two analogues (3 and 4) of siastatin were also prepared.
The resolved piperidinecarboxylate (R)-7 was converted to siastatin B (1) by an efficient and stereoselective sequence that includes a bromo-beta -lactonization and an N-acyliminium azidation. Two analogues (3 and 4) of siastatin were also prepared.
The resolved piperidinecarboxylate (R)-7 was converted to siastatin B (1) by an efficient and stereoselective sequence that includes a bromo-beta -lactonization and an N-acyliminium azidation. Two analogues (3 and 4) of siastatin were also prepared.