Multi-step reaction with 8 steps
1: 39 percent / imidazole / dimethylformamide; hexamethylphosphoric acid triamide / 1.33 h / 50 °C
2: 31 percent / potassium tert-butoxide / tetrahydrofuran / -78 °C / a) 15 min b) 5 h
3: 78 percent / CuI, Et3N / PdCl2(PPh3)2 / a) 50 deg C, 3 h b) room temp., overnight
4: 94 percent / NH4OH / methanol / 18 h / Ambient temperature
5: 97 percent / HOAc, tetrabutylammonium fluoride / tetrahydrofuran / 8.67 h / Ambient temperature
6: 86 percent / methyltriphenoxyphosphonium iodide / CH2Cl2 / 1. -78 deg C -> room temp. , 30 min 2. 2 h at room temp.
7: LDA (diisopropyl amine, n-BuLi) / 1. -78 deg C, 30 min, THF, HMPT 2.a) -78 deg C, THF, 3 h b) -78 deg C -> 0 deg C, 1 h c) 0 deg C, 1 h d) room temp., 2 h
8: 1. 80percent HCOOH 2. aqu. MeOH, K2CO3 / 1. 5 h, room temp. 2. room temp.
With
1H-imidazole; ammonium hydroxide; copper(l) iodide; formic acid; potassium tert-butylate; tetrabutyl ammonium fluoride; methyltriphenoxyphosphonium iodide; potassium carbonate; acetic acid; triethylamine; lithium diisopropyl amide;
bis-triphenylphosphine-palladium(II) chloride;
In
tetrahydrofuran; methanol; N,N,N,N,N,N-hexamethylphosphoric triamide; dichloromethane; N,N-dimethyl-formamide;
DOI:10.1021/jo00297a034