作者:Kiyoshi Tomioka、Tsuneo Ishiguro、Yōichi Iitaka、Kenji Koga
DOI:10.1016/s0040-4020(01)82416-9
日期:1984.1
A virtually complete asymmetric control in the synthesis of 2,3-disubstituted butan-4-olide (10) was demonstrated by employing the butenolide (12) as the chiral acceptor for the conjugate 1,4-addition. Highly efficient asymmetric total synthesis of natural (-)- and unnatural (+)-steganacin was accomplished. The absolute stereostructure of natural antitumor steganain was determined to be 1.
通过使用丁烯内酯(12)作为共轭1,4-加成的手性受体,证明了合成2,3-二取代的丁-4-醇(10)时几乎完全不对称。完成了天然(-)-和非天然(+)-甜菊糖的高效不对称全合成。天然抗肿瘤甜菜碱的绝对立体结构被确定为1。