Multi-step reaction with 13 steps
1: O3; Ph3P / CH2Cl2 / 2 h / -78 °C
2: toluene / 3 h / 100 °C
3: H2 / Pd/C / ethanol / 3 h
4: PCC; AcONa / CH2Cl2 / 3 h / 20 °C
5: PhLi / tetrahydrofuran / 4 h / -78 - 20 °C
6: Cl2CHCO2H / CH2Cl2 / 2 h / 0 °C
7: 72 percent / [CpTiCl((S,S)-2,3-Me2CO2-1,1,4,4-Ph4-1,4-butanediolato)] / diethyl ether / 2 h / -78 °C
8: 70 percent / 2,6-lutidine / CH2Cl2 / 1 h / 0 °C
9: 71 percent / O3; Ph3P / CH2Cl2 / 0.25 h / -78 °C
10: 66 percent / [CpTiCl((R,R)-2,3-Me2CO2-1,1,4,4-Ph4-1,4-butanediolato)] / diethyl ether / 2 h / -78 °C
11: pyridine / 1 h / 0 - 20 °C
12: H2 / Pd(OH)2 / methanol / 1 h / 20 °C
13: DMAP / toluene / 3 h / 20 °C
With
pyridine; 2,6-dimethylpyridine; dichloro-acetic acid; dmap; [CpTiCl((R,R)-2,3-Me2CO2-1,1,4,4-Ph4-1,4-butanediolato)]; [CpTiCl((S,S)-2,3-Me2CO2-1,1,4,4-Ph4-1,4-butanediolato)]; hydrogen; sodium acetate; ozone; phenyllithium; triphenylphosphine; pyridinium chlorochromate;
palladium dihydroxide; palladium on activated charcoal;
In
tetrahydrofuran; methanol; diethyl ether; ethanol; dichloromethane; toluene;
1: ozonolysis / 2: Wittig olefination / 3: Catalytic hydrogenation / 4: Oxidation / 5: Wittig olefination / 6: vinyl ether cleavage / 7: Alkylation / 8: silylation / 9: ozonolysis / 10: Alkylation / 11: silylation / 12: Catalytic hydrogenation / 13: Esterification;
DOI:10.7164/antibiotics.52.1146