... O Me 3 Si R CH 2 Cl 2 N Bn TBSO O OTBS N Bn TBSO O OAc OTBS MgBr2 100% dr ... N OMOM MOMO MeO Et2O, reflux N OMOM MOMO HAr N P1 P 1 PhO2S O RMgBr ZnCl 2 ...
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