Multi-step reaction with 9 steps
1: 38.9 g / CuCN / tetrahydrofuran; diethyl ether / -78 - 20 °C
2: 10.3 g / 4A molecular sieves, titanium tetraisopropoxide, diethyl D-tartrate, tert-butyl hydroperoxide / CH2Cl2; 2,2,4-trimethyl-pentane / 20 h / -22 °C
3: 2.7 g / titanium tetraisopropoxide, azidotrimethylsilane / benzene / 0.25 h / Heating
4: 1.) 2-acetoxyisobutyryl chloride, 2.) NaOMe / 1.) chloroform, RT, 5 h, 2.) THF, RT, 3 h
5: 9.63 g / propan-2-ol / 80 °C
6: 4.68 g / H2 / 10percent Pd/C / tetrahydrofuran; methanol; acetic acid / 12 h
7: 0.126 g / 1-hydroxybenzotriazole hydrate, 1-ethyl-3-(3-(dimethylamino)propyl)carbodiimide hydrichloride, triethylamine / dimethylformamide / 12 h / 23 °C
8: H2 / 5percent Pd/C / tetrahydrofuran
9: Et3N / tetrahydrofuran / 3 h / Ambient temperature
With
titanium(IV) isopropylate; tert.-butylhydroperoxide; diethyl (2S,3S)-tartrate; trimethylsilylazide; 4 A molecular sieve; hydrogen; sodium methylate; 2-acetoxy-2-methylpropanoyl chloride; 1-hydroxybenzotriazol-hydrate; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; triethylamine;
palladium on activated charcoal;
In
tetrahydrofuran; methanol; 2,2,4-trimethylpentane; diethyl ether; dichloromethane; acetic acid; N,N-dimethyl-formamide; isopropyl alcohol; benzene;
DOI:10.1021/jm00068a006