A concise and efficient totalsynthesis of (+)-11,12-epoxysarcophytol A (1), an epoxy cembrane diterpenoid from marine soft coral Lobophytum, is described, which allows the assignment of an absoluteconfiguration (11S,12S) of the epoxide function unambiguously.
Z-selective formation of trisubstituted α,β-unsaturated nitrile by the Horner-Emmons reaction
作者:Hisao Takayanagi
DOI:10.1016/s0040-4039(00)76763-3
日期:1994.3
Conditions which allow the Horner-Emmons reaction of phosphononitrile to proceed Z-selectively were clarified. The generality and usefulness of the procedure were demonstrated by an application to a stereoselective synthesis of plaunotol (9).
Acyclic terpene compounds useful as intermediates for producing sarcophytol A which have an anti-carcinogenic promoter activity and anti-tumor activity, which compounds are shown by the general formula (I): ##STR1##
Use of β-Chloropropionaldehyde as an Acrolein Equivalent in the Wadsworth-Emmons Modification of the Wittig Reaction
作者:Kohtaro Tomizawa、David S. Watt、George R. Lenz
DOI:10.1055/s-1985-31373
日期:——
ß-Chloropropionaldehyde (3) has been used as an acrolein equivalent to prepare 5-chloro-2-pentenoates 5 and 5-chloro-2-pentenenitriles 6 by condensing with phosphonates 1.
The present invention provides novel acyclic terpenes of the formula:
which are useful as intermediates for the industrially advantageous production of sarcophytol A.