反应详情

Prepared from 2,3-dihydro-6-fluoro-2-propyl-4H-1-benzopyran-4-one via the intermediacy of the more polar diastereomer of 1'-benzyloxy-2,3-dihydro-6-fluoro-2-(2-propyl)-spiro-(4H-1-benzopyran-4,3'-pyrrolidine)-2'one (Rf=0.2, 1:1 diethyl ether/hexanes) using the same procedure for preparation of Example 7 from 2,3-dihydro-6-fluoro-2-(2-phenylethyl-4H-1-benzopyran-4-one.