Multi-step reaction with 8 steps
1: 85 percent / Zn, I2 / benzene; diethyl ether; tetrahydrofuran / 1.25 h / Heating
2: 85 percent / H2, acetic acid / 5percent Pd/C / ethanol / 115 h
3: 1.) LDA, 2.) I2 / 1.) hexane, THF, -78 deg C, 10 min, 2.) a) -78 deg C, 20 min, b) from -78 deg C to 0 deg C, 30 min
4: 1.) NaH / 1.) Me2SO, RT, 5 min, 2.) 20 deg C, 1 h
5: 79 percent / t-BuOK / 2-methyl-propan-2-ol / 4 h / Heating
6: 40 percent / BH3-THF / 5 h / 0 °C
7: CF3COOH / 2 h
8: diphenyl phosphorazidate (DPPA), Et3N / dimethylformamide / 1.) 0 deg C, 30 min, 2.) RT, 63 h
With
borane-THF; diphenyl phosphoryl azide; potassium tert-butylate; hydrogen; iodine; sodium hydride; acetic acid; triethylamine; trifluoroacetic acid; zinc; lithium diisopropyl amide;
palladium on activated charcoal;
In
tetrahydrofuran; diethyl ether; ethanol; N,N-dimethyl-formamide; tert-butyl alcohol; benzene;
DOI:10.1021/jm00106a012