Enantioselective Synthesis of
<i>cis</i>
‐2,
<scp>6‐Disubstituted</scp>
‐4‐methylene Tetrahydropyrans via Chromium Catalysis
<sup>†</sup>
作者:Jing Bai、Bin Chen、Guozhu Zhang
DOI:10.1002/cjoc.202000296
日期:2020.12
2‐(trimethylsilyl methyl)allylation and Prins cyclization. Commercially available (2‐(chloromethyl)allyl)trimethylsilane serves as the bifunctional linchpin to combine two aldehydes to assemble the 2,6‐disubstituted pyrans. A variety of functional groups are compatible under the mild reaction conditions. The synthetic utility of this methodology was demonstrated by the asymmetricsynthesis of 16 examples of
[reaction: see text] The development of an approach leading to the totalsynthesis of dactylolide is described. The key features of this route include a catalytic asymmetric allylation, a diastereoselective pyran annulation, and a Horner-Wadsworth-Emmons macrocyclization.