First asymmetric total synthesis of (+)-steganacin determination of absolute stereochemistry
作者:Kiyoshi Tomioka、Tsuneo Ishiguro、Kenji Koga
DOI:10.1016/0040-4039(80)88012-9
日期:1980.1
(+)-Steganacin was synthesized in a new and highly specific asymmetric pathway based on the novel application of chiral γ-lactone as a chiral synthon. By this synthesis the absolutestereochemistry of natural (−)-steganacin could be determined in unequivocal way.
Asymmetric total synthesis of natural (-)-and unnatural (+)-steganacin
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.