Multi-step reaction with 7 steps
1.1: sodium hydroxide / water / 20 °C / Inert atmosphere
2.1: oxalyl dichloride / N,N-dimethyl-formamide; 1,4-dioxane / 20 °C / Inert atmosphere
2.2: 5 °C / Inert atmosphere
3.1: 1H-imidazole / N,N-dimethyl-formamide / 2 h / 12 °C / Inert atmosphere; Industrial scale
4.1: tris-(dibenzylideneacetone)dipalladium(0); 2,2'-bis-(diphenylphosphino)-1,1'-binaphthyl; sodium t-butanolate / toluene / 70 °C / Inert atmosphere
5.1: Wilkinson's catalyst / acetonitrile; water / 100 °C / Inert atmosphere
6.1: N,N-dimethyl-formamide; dichloromethane / 3 h / -3 - -1 °C / Inert atmosphere; Industrial scale
7.1: hydrogenchloride / tetrahydrofuran; water / 3 h / 2 - 3 °C / Inert atmosphere; Industrial scale
With
1H-imidazole; hydrogenchloride; tris-(dibenzylideneacetone)dipalladium(0); Wilkinson's catalyst; oxalyl dichloride; 2,2'-bis-(diphenylphosphino)-1,1'-binaphthyl; sodium hydroxide; sodium t-butanolate;
In
tetrahydrofuran; 1,4-dioxane; dichloromethane; water; N,N-dimethyl-formamide; toluene; acetonitrile;
DOI:10.1021/acs.oprd.6b00415