Scheme 2.
Synthesis of Photochemical Radical Precursors 2a and 2ba
aReagents and conditions: (a) 5% Rh/Al2O3, H2 (45 psi), MeOH; (b) (i) pTSA, dimethoxy propane, DMF, (ii) BzCl; (c) TFA/H2O (1:1).
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