Organic Letters
Organic Letters
5 years ago

Organocatalytic Enantioselective Michael–Acetalization–Reduction–Nef Reaction for a One-Pot Entry to the Functionalized Aflatoxin System. Total Synthesis of (−)- Dihydroaflatoxin D2 and (−)- and (+)-Microminutinin

Organocatalytic Enantioselective Michael–Acetalization–Reduction–Nef Reaction for a One-Pot Entry to the Functionalized Aflatoxin System. Total Synthesis of (−)- Dihydroaflatoxin D2 and (−)- and (+)-Microminutinin
Bor-Cherng Hong, Wei-Lun Huang, Gene-Hsiang Lee, Arun Raja
An efficient method has been developed for the enantioselective synthesis of the aflatoxin system with multiple stereocenters via a sequence of organocatalytic Michael–acetalization–reduction–Nef reactions that proceed with high enantioselectivities (90–99% ee). The one-pot reaction sequence provides a facile entry to the aflatoxin system, including dihydroaflatoxin D2, which includes a formal total synthesis of aflatoxin B2. The first total synthesis of (−)- and (+)-microminutinin was also achieved via this protocol.

Publisher URL: http://dx.doi.org/10.1021/acs.orglett.7b01473

DOI: 10.1021/acs.orglett.7b01473

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