Organocatalytic enantioselective synthesis of phthalans via Wittig/
<scp>oxa‐Michael</scp>
cascade reaction
作者:Eun Chae Son、Jaeeun No、Sung‐Gon Kim
DOI:10.1002/bkcs.12402
日期:2021.11
An enantioselective synthetic method for 1-substituted phthalans has been developed. The organocatalytic reaction between 1,3-dihydro-2-benzofuran-1-ols and Wittig reagents using cinchona squaramide-based organocatalyst proceeded with sequential Wittig reaction followed by an enantioselective intramolecular oxa-Michael reaction, yielding enantioenriched phthalans with moderate to good enantioselectivities