How is [(1a,3b,5z,7e)-25-[(Tetrahydro-2H-pyran-2-yl)oxy]-9,10-secocholesta-5,7,10(19)-triene-1,3-diyl]bis(oxy)]bis[(1,1-dimethylethyl)dimethylsilane] (CAS: 211866-07-8) typically synthesized?

This compound is typically synthesized via Wittig-type reactions and subsequent functionalization steps. Commonly, it involves the use of phosphonium salts as the Wittig reagent, followed by coupling with appropriate alcohols to form the desired structure. The synthesis often requires mild conditions and the use of phase transfer catalysts to ensure high yield and selectivity.