Stage #1: With  N,N-diethylaminodimethylsilane; platinum (II) chloride; 2-(dicyclohexylphosphino)-2',4',6'-tri-i-propyl-1,1’-biphenyl in  tetrahydrofuran T=50°C;  Inert atmosphere; Stage #2: With  potassium fluoride; dihydrogen peroxide; potassium hydrogencarbonate in  tetrahydrofuran; methanol; water T=20°C; Fleming-Tamao Oxidation;  Inert atmosphere;  Reagent/catalyst;  diastereoselective reaction;