Asymmetric Reduction of Diynones and the Total Synthesis of (S)-Panaxjapyne A
摘要:
The asymmetric transfer hydrogenation of a series of diynones has been achieved in high conversion and enantiomeric induction. When R-1 is a phenyl group, a competing alkyne reduction takes place; however, when R-1 is an alkyl group, this side-reaction is not observed. The application of the reduction to the total synthesis of the natural product (S)-panaxjapyne A in high enantiomeric excess is described.
Asymmetric Reduction of Diynones and the Total Synthesis of (S)-Panaxjapyne A
摘要:
The asymmetric transfer hydrogenation of a series of diynones has been achieved in high conversion and enantiomeric induction. When R-1 is a phenyl group, a competing alkyne reduction takes place; however, when R-1 is an alkyl group, this side-reaction is not observed. The application of the reduction to the total synthesis of the natural product (S)-panaxjapyne A in high enantiomeric excess is described.
A mild and efficient method has been developed for the synthesis of alkyl and alkenyl iodides from alkenes and alkynes using polymethylhydrosiloxane (PMHS) and iodine in chloroform at room temperat...