Multi-step reaction with 9 steps
1.1: oxalyl dichloride / N,N-dimethyl-formamide / dichloromethane / 5 h / 20 °C
2.1: n-butyllithium / tetrahydrofuran / 0.58 h / -65 °C
2.2: 0.75 h / -65 °C
3.1: diethylaluminium chloride / dichloromethane / 0 - 20 °C
4.1: 2,2-Dimethyl-1,3-propanediol / toluene-4-sulfonic acid / toluene / 3 h / Reflux
4.2: 0 - 20 °C
5.1: sodium hydrogen sulfate / water; ethyl acetate / 12 h / 20 °C
6.1: methanol / benzene / 20 °C
7.1: titanium(IV) isopropylate / dichloromethane / 20 °C
7.2: -78 - 20 °C
8.1: lithium hydroxide / tetrahydrofuran / 24 h / 70 °C
8.2: Cooling with ice
9.1: HATU / N,N-dimethyl acetamide / 0.17 h / 20 °C
9.2: 0.83 h
With
titanium(IV) isopropylate; methanol; sodium hydrogen sulfate; n-butyllithium; oxalyl dichloride; diethylaluminium chloride; 2,2-Dimethyl-1,3-propanediol; HATU; lithium hydroxide;
toluene-4-sulfonic acid; N,N-dimethyl-formamide;
In
tetrahydrofuran; dichloromethane; N,N-dimethyl acetamide; water; ethyl acetate; toluene; benzene;