The intramolecular nitrile oxide cycloaddition (INOC) route to the ergot alkaloids: Use of the isoxazoline to γ-amino alcohol conversion in the total synthesis of (+)-paliclavine
作者:Alan P. Kozikowski、Chen Yon-Yih、Wang B.C、Zhang-Bao Xu
DOI:10.1016/0040-4020(84)80018-6
日期:1984.1
A totalsynthesis of the ergotalkaloid paliclavine (20), in optically active form is described. The synthesis scheme is based on the intramolecular dipolar cycloaddition reaction of a nitrile oxide to a neighboring olefinic appendage bearing an allylic asymmetric center. The extent of diastereofacial selection in the intramolecular nitrile oxide cycloaddition (INOC) reaction was found to be marginal
Synthetic studies on (2R,4'R,8'R)-.alpha.-tocopherol. An approach utilizing side chain synthons of microbiological origin
作者:Noal Cohen、Wayne F. Eichel、Rocco J. Lopresti、Christian Neukom、Gabriel Saucy
DOI:10.1021/jo00884a002
日期:1976.10
Acyclic stereoselection. 44. Diastereoselectivity in the ortho ester Claisen rearrangement of chiral propargylic alcohols. Use of .beta.-allenic esters as chiral methylmalonaldehyde synthons