Scheme 3.
Route to potential intermediate 8:15 (a) (i) (t-Bu)2Si(OTf)2, DMF; (ii) Me3SiCl, imidazole; (iii) BzCl, (i-Pr)2NEt, pyridine (96% from 1); (b) PyCHO, Et3SiH, TMSOTf, 1,4-dioxane (53%).
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