Multi-step reaction with 16 steps
1.1: 60 percent / TiCl3(O-i-Pr) / CH2Cl2; toluene / 0.25 h / -78 °C
2.1: DMAP; Et3N / CH2Cl2 / 0.5 h / 0 °C
3.1: 9-BBN / tetrahydrofuran / 2 h / 20 °C
3.2: aq. H2O2; aq. NaHCO3 / tetrahydrofuran; ethanol / 0.5 h / 20 °C
4.1: imidazole / dimethylformamide / 20 °C
5.1: DIBALH / CH2Cl2; toluene / 0.5 h / -78 °C
6.1: DMSO; Et3n; SO3*Py / CH2Cl2 / 0.5 h / 0 °C
7.1: tetrahydrofuran; diethyl ether / 0.67 h / -78 °C
8.1: 84 percent / oxalyl chloride; DMSO; Et3N / CH2Cl2 / -78 - 20 °C
9.1: i-Pr2NEt / CH2Cl2 / 0.75 h / -10 °C
10.1: N-bromosuccinimide / tetrahydrofuran / 0.33 h / 0 °C
11.1: camphorsulfonic acid / CH2Cl2; methanol / 0.67 h / 0 °C
12.1: DMSO; Et3N; SO3*Py / CH2Cl2 / 0.67 h / 0 °C
13.1: SmI2 / tetrahydrofuran / 1 h / -78 °C
13.2: DMAP / tetrahydrofuran / 0.67 h / 0 °C
14.1: 84 percent / BF3*OEt2 / acetonitrile / 0 - 20 °C
15.1: 79 percent / DIBALH / CH2Cl2; toluene / 0.5 h / -78 °C
16.1: 93 percent / DMAP / acetonitrile / 4 h / 20 °C
With
1H-imidazole; dmap; N-Bromosuccinimide; 9-borabicyclo[3.3.1]nonane dimer; samarium diiodide; oxalyl dichloride; titanium(IV) trichloride isopropoxide; pyridine-SO3 complex; camphor-10-sulfonic acid; boron trifluoride diethyl etherate; diisobutylaluminium hydride; dimethyl sulfoxide; triethylamine; N-ethyl-N,N-diisopropylamine;
In
tetrahydrofuran; methanol; diethyl ether; dichloromethane; N,N-dimethyl-formamide; toluene; acetonitrile;
1.1: Cyclization / 2.1: Acetylation / 3.1: Addition / 3.2: Oxidation / 4.1: Substitution / 5.1: Reduction / 6.1: Oxidation / 7.1: Addition / 8.1: Oxidation / 9.1: Substitution / 10.1: Bromination / 11.1: desilylation / 12.1: Oxidation / 13.1: Cyclization / 13.2: Acetylation / 14.1: Elimination / 15.1: Reduction / 16.1: Acylation;
DOI:10.1016/S0040-4020(99)00620-1