Multi-step reaction with 17 steps
1: 87 percent / DDQ / CH2Cl2 / 0.17 h / 25 °C
2: 93 percent / K2CO3, Bu4NI / dimethylformamide / 6 h / 25 °C
3: t-BuOK, EtOH / CH2Cl2 / 7 h / -67 - 25 °C
4: 68 percent / Et3N, DMAP
5: 5 percent / Dibal-H / tetrahydrofuran; toluene / 3 h / -78 °C
6: 2.) I2 / 1.) THF, hexane, from -78 deg C to 25 deg C, 12 h, 2.) CH2Cl2, 25 deg C, 5 d
7: 1.) Dibal-H, 2.) 1.0 M aq. phosphate buffer / 1.) toluene, -30 deg C, 1 h, 2.) toluene, 25 deg C, 20 min
8: tetrahydrofuran / 2 h / -78 - 0 °C
9: imidazole / dimethylformamide / 22 h / 25 °C
10: 35 percent / Ac2O / heptane / 47 h / 50 °C
11: 52 percent / K2CO3, Bu4NI / acetone / 53 h / 25 °C
12: Bu4NF / tetrahydrofuran / 10.5 h / 50 °C
13: DMSO, TFAA / CH2Cl2 / 1 h / -78 °C
14: DBU / CH2Cl2 / 20 h / -78 - 25 °C
15: 1.) TFAA, DMSO, 2.) Et3N / 1.) CH2Cl2, -78 deg C, 1 h, 2.) CH2Cl2, 25 deg C, 30 min
17: 1.) BBr3, 2.) air, 3.) TsOH, NaBr
With
1H-imidazole; dmap; phosphate buffer; air; ethanol; potassium tert-butylate; tetrabutyl ammonium fluoride; iodine; acetic anhydride; boron tribromide; tetra-(n-butyl)ammonium iodide; diisobutylaluminium hydride; potassium carbonate; toluene-4-sulfonic acid; dimethyl sulfoxide; 1,8-diazabicyclo[5.4.0]undec-7-ene; triethylamine; trifluoroacetic anhydride; 2,3-dicyano-5,6-dichloro-p-benzoquinone; sodium bromide;
In
tetrahydrofuran; n-heptane; dichloromethane; N,N-dimethyl-formamide; acetone; toluene;
DOI:10.1021/ja00153a004