12626-18-5Relevant articles and documents
Total synthesis of verruculogen and fumitremorgin a enabled by ligand-controlled C-H borylation
Feng, Yu,Holte, Dane,Zoller, Jochen,Umemiya, Shigenobu,Simke, Leah R.,Baran, Phil S.
, p. 10160 - 10163 (2015)
Verruculogen and fumitremorgin A are bioactive alkaloids that contain a unique eight-membered endoperoxide. Although related natural products such as fumitremorgins B and C have been previously synthesized, we report the first synthesis of the more complex, endoperoxide-containing members of this family. A concise route to verruculogen and fumitremorgin A relied not only on a hydroperoxide/indole hemiaminal cyclization, but also on the ability to access the seemingly simple starting material, 6-methoxytryptophan. An iridium-catalyzed C-H borylation/Chan-Lam procedure guided by an N-TIPS group enabled the conversion of a tryptophan derivative into a 6-methoxytryptophan derivative, proving to be a general way to functionalize the C6 position of an N,C3-disubstituted indole for the synthesis of indole-containing natural products and pharmaceuticals.