Triterpenoid total synthesis. Part 6. Synthesis of testudinariols A and B,triterpene metabolites of the marine mollusc Pleurobrancus testudinarius.

Testudinariols A (1) and B (1') are ichthyotoxic and structurally unusual t riterpene alcohols isolated from the skin and the mucus of the marine mollu sc Pleurobrancus testudinarius. The first synthesis of (+)-1 and (+)-1' was achieved by starting from (R)-glycidol.