Multi-step reaction with 8 steps
1.1: formic acid; sulfuric acid / 24 h / 80 °C
1.2: 2 h / 0 - 20 °C
2.1: [bis(acetoxy)iodo]benzene; 2,2,6,6-Tetramethyl-1-piperidinyloxy free radical / dichloromethane; N,N-dimethyl acetamide / 6 h / 20 °C
3.1: sodium hydride / tetrahydrofuran / 1 h / 0 °C / Inert atmosphere
3.2: 6 h / 0 - 20 °C / Inert atmosphere
4.1: (3aR)-1-methyl-3,3-diphenyl-tetrahydro-pyrrolo[1,2-c][1,3,2]oxazaborole; dimethylsulfide borane complex / tetrahydrofuran; toluene / 1 h / -30 °C
5.1: 1H-imidazole / dichloromethane / 18 h / 20 °C
6.1: diisobutylaluminium hydride / dichloromethane / 2 h / -78 °C
7.1: potassium hexamethylsilazane / tetrahydrofuran / 0.67 h / 0 °C / Inert atmosphere
7.2: 4 h / -20 - -10 °C / Inert atmosphere
8.1: Dess-Martin periodane / dichloromethane / 20 °C
With
1H-imidazole; formic acid; 2,2,6,6-Tetramethyl-1-piperidinyloxy free radical; [bis(acetoxy)iodo]benzene; dimethylsulfide borane complex; sulfuric acid; potassium hexamethylsilazane; sodium hydride; diisobutylaluminium hydride; Dess-Martin periodane; (3aR)-1-methyl-3,3-diphenyl-tetrahydro-pyrrolo[1,2-c][1,3,2]oxazaborole;
In
tetrahydrofuran; dichloromethane; N,N-dimethyl acetamide; toluene;
3.1: |Horner-Wadsworth-Emmons Olefination / 3.2: |Horner-Wadsworth-Emmons Olefination / 4.1: |Corey-Bakshi-Shibata Reduction;
DOI:10.1002/anie.201902371