Total Synthesis of (−)-Nakadomarin A

A concise diastereoselective total synthesis of (−)-nakadomarin A has been completed in 21 steps from d-pyroglutamic acid. Key steps include an enecarbamate Michael addition/furan-N-acyliminium ion cascade cyclization to provide the tetracyclic core and ring-closing alkyne and alkene metatheses to construct the fifteen- and eight-membered azacycles, respectively.