Palladium[0]-mediated aminospirocyclization of tertiary allylic sulfones. Stereospecific construction of the azabicyclic ring system of cephalotaxine
作者:Zhendong Jin、F.L Puchs
DOI:10.1016/0040-4039(96)01112-4
日期:1996.7
Tertiary allylic sulfones which bear a secondary aminopropyl moiety undergo smooth palladium [0]-mediated spirocyclization. The reaction proceeds via a π-allyl intermediate and the resultant azabicyclic product is formed with net retention of sulfonestereochemistry. The use of tetramethylguanidine as companion base is required for high yielding reactions.