A concise highly enantioselective cascade synthesis of indolizidine alkaloids with a quaternary stereocenter
作者:Daniele Muroni、Antonio Saba、Nicola Culeddu
DOI:10.1016/j.tetasy.2004.07.013
日期:2004.9
bearing a quaternary stereocenter were obtained by Rh(II)-catalyzed decomposition of α-diazo ketodiesters through a carbenoid/spiro[5,5]ammonium ylide/Stevens [1,2]-shift with a ring-expansion cascade process. The isolation of stable chiral ammonium ylides, namely the key intermediates of the process, unambiguously confirmed the stereochemistry of the total process.