Multi-step reaction with 13 steps
1: imidazole / dimethylformamide / 1.17 h / 50 °C
2: 1.45 g / HN(TMS)2; n-BuLi / tetrahydrofuran; hexane / 0.5 h / -78 °C
3: iPr2NEt; CuI / Pd2(dba)3*CHCl3 / dimethylformamide / 1 h / 20 °C
4: 1.79 g / TBAF / tetrahydrofuran / 1 h / -60 °C
5: 88 percent / ZnBr2 / CH2Cl2 / 2.5 h / 20 °C
6: 71 percent / Dess-Martin periodinane / CH2Cl2 / 3 h / 20 °C
7: 98 percent / CeCl3; n-BuLi; HN(TMS)2 / tetrahydrofuran; hexane / -25 - 0 °C
8: 78 percent / DMAP; Et3N / CH2Cl2 / 0.5 h / 0 °C
9: 88 percent / Me3BBr / CH2Cl2 / 0.5 h / -90 °C
10: 86 percent / TBAF / tetrahydrofuran / 1 h / -50 °C
11: n-Bu3P / tetrahydrofuran / 0.75 h / 20 °C
12: 5.1 mg / aq. H2O2 / tetrahydrofuran / 20 °C
13: 10 percent / Cp2TiCl / tetrahydrofuran / 1 h / 0 °C
With
1H-imidazole; dmap; copper(l) iodide; n-butyllithium; cerium(III) chloride; tributylphosphine; tetrabutyl ammonium fluoride; dihydrogen peroxide; Dess-Martin periodane; triethylamine; N-ethyl-N,N-diisopropylamine; 1,1,1,3,3,3-hexamethyl-disilazane; zinc dibromide;
tris(dibenzylideneacetone)dipalladium(0) chloroform complex; bis(cyclopentadienyl)titanium (III) chloride;
In
tetrahydrofuran; hexane; dichloromethane; N,N-dimethyl-formamide;
3: Sonogashira coupling / 6: Dess-Martin oxidation;
DOI:10.1021/ol048494i