Asymmetric Radical Synthesis of 2,5-Diaryl-2,3-dihydrofurans − Application to the Preparation of (+)-Phyltetralin
作者:Frédéric Garzino、Alain Méou、Pierre Brun
DOI:10.1002/ejoc.200390198
日期:2003.4
The diastereoselective MnIII-promoted radical addition of β-oxo ester 1 onto N-cinnamoyloxazolidinone 2 affords, after removal of the chiral auxiliary, the enantiopure 2,5-diaryl-2,3-dihydrofuran (−)-4. Its SnCl4-induced rearrangement leads to a 4-aryltetralone immediate precursor of the aryltetralin lignan (+)-phyltetralin (9). (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)
β-氧代酯 1 与 N-肉桂酰恶唑烷酮 2 的非对映选择性 MnIII 促进的自由基加成在去除手性助剂后得到对映体纯的 2,5-二芳基-2,3-二氢呋喃 (-)-4。其 SnCl4 诱导的重排导致 4-芳基四氢萘酮直接前体的芳基四氢萘木酚素 (+)-phyltetralin (9)。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)