Asymmetric synthesis of <i>trans</i>-4,5-disubstituted γ-butyrolactones involving a key allylboration step. First access to (−)-nicotlactone B and (−)-galbacin
作者:S. Henrion、A. Macé、M. M. Vallejos、T. Roisnel、B. Carboni、J. M. Villalgordo、F. Carreaux
DOI:10.1039/c8ob00101d
日期:——
An efficient asymmetric synthesis of trans-4,5-disubstituted γ-butyrolactones from aldehydes and enantioenriched γ-carbamate alkenylboronates is reported. The cornerstone of this strategy is the implementation of sequential [3,3]-allyl cyanate rearrangement/allylboration/nucleophilic addition/cyclisation reactions. Diverse γ-butyrolactones such as the flavouring compounds, (+)-trans-whiskey lactone