Multi-step reaction with 7 steps
1.1: (R,R)-(-)-2,6-bis[2-(hydroxyldiphenylmethyl)-1-pyrrolidinyl-methyl]-4-methylphenole; diethylzinc / tetrahydrofuran; hexane / 12 h / 20 °C / Inert atmosphere; Molecular sieve
2.1: camphor-10-sulfonic acid / dichloromethane / 1 h / 20 °C / Inert atmosphere
3.1: sodium tetrahydroborate / tetrahydrofuran / 0 - 20 °C / Inert atmosphere
4.1: Dess-Martin periodane / dichloromethane / 3 h / 0 - 20 °C
5.1: N,N,N,N,N,N-hexamethylphosphoric triamide; lithium hexamethyldisilazane / tetrahydrofuran; N,N-dimethyl-formamide / 12 h / -35 - 20 °C / Inert atmosphere
6.1: diisobutylaluminium hydride / dichloromethane / -78 - 0 °C / Inert atmosphere
7.1: 2,4,6-trichlorobenzoyl chloride; N-ethyl-N,N-diisopropylamine / tetrahydrofuran / 0.17 h / 20 °C / Inert atmosphere
7.2: 2 h / 20 °C / Inert atmosphere
With
N,N,N,N,N,N-hexamethylphosphoric triamide; sodium tetrahydroborate; (R,R)-(-)-2,6-bis[2-(hydroxyldiphenylmethyl)-1-pyrrolidinyl-methyl]-4-methylphenole; 2,4,6-trichlorobenzoyl chloride; camphor-10-sulfonic acid; diethylzinc; diisobutylaluminium hydride; Dess-Martin periodane; N-ethyl-N,N-diisopropylamine; lithium hexamethyldisilazane;
In
tetrahydrofuran; hexane; dichloromethane; N,N-dimethyl-formamide;
1.1: Aldol reaction;
DOI:10.1002/chem.201102899