Multi-step reaction with 21 steps
1: 92 percent / DIBAL-H / toluene / 1 h / -78 °C
2: 1.) Ac2O, DMAP, TEA, 2.) BF3*OEt2 / 1) CH2Cl2, rt, 1 h; 2) CH2Cl2, -78 deg C, 1 h
3: 92 percent / H2 / Pd/C / ethyl acetate / 5 h / 760 Torr
4: 94 percent / DIBAL-H / toluene / 1 h / -78 °C
5: 85 percent / PhCO2H / CH2Cl2 / 12 h / Ambient temperature
6: 1.5 g / H2 / Pd/C / ethyl acetate / 5 h / Ambient temperature
7: 65 percent / DIPEA / CH2Cl2 / 48 h / 0 °C
8: 0.5 g / n-BuNF / tetrahydrofuran / 3 h / Ambient temperature
9: 1.) oxalyl chloride, DMSO, 2.) DIPEA / 1) THF, -78 to -35 deg C, 15 min; 2) THF, ether, 0 deg C
10: TPAP, N-methylmorpholine N-oxide, 4 Angstroem molecular sieves / CH2Cl2 / 1 h / Ambient temperature
11: 105 mg / L-selectride / tetrahydrofuran / 1 h / -78 °C
12: 88 percent / DIPEA / CH2Cl2 / 12 h / 4 °C
13: 1.) n-BuLi / 1) THF, hexane, 0 deg C, 15 min; 2) THF, hexane, -40 to 0 deg C, 1 h
14: 94 percent / Na2HPO4, Na-Hg amalgam / methanol / 3 h / 0 °C
15: 84 percent / LiAlH4 / tetrahydrofuran / 0.5 h / 0 °C
16: 100 percent / DIPEA / CH2Cl2 / 4 h / 4 °C
17: 95 percent / n-BuNF / tetrahydrofuran / 3 h / Ambient temperature
18: TPAP, N-methylmorpholine N-oxide, 4 Angstroem molecular sieves / CH2Cl2 / 1 h / Ambient temperature
19: CH2Cl2 / 5 h / Ambient temperature
20: 97 percent / NiCl2*6H2O, NaBH4 / methanol / 0.08 h / 0 °C
21: 1.) n-BuLi, DIPEA, 3.) CSA, 4.) TEA, MsCl, 5.) DBU / 1) THF, hexane, -78 deg C, 30 min; 2) THF, hexane, -78 deg C, 25 min; 3) methanol, water, rt, 4 h; 4) CH2Cl2, 0 deg C --> rt, 2 h; 5) CH2Cl2, 0 deg C, 30 min
With
dmap; sodium tetrahydroborate; disodium hydrogenphosphate; lithium aluminium tetrahydride; n-butyllithium; tetrapropylammonium perruthennate; sodium amalgam; oxalyl dichloride; 4 A molecular sieve; TEA; camphor-10-sulfonic acid; boron trifluoride diethyl etherate; hydrogen; acetic anhydride; L-Selectride; diisobutylaluminium hydride; dimethyl sulfoxide; methanesulfonyl chloride; 4-methylmorpholine N-oxide; 1,8-diazabicyclo[5.4.0]undec-7-ene; N-ethyl-N,N-diisopropylamine; benzoic acid; nickel dichloride;
palladium on activated charcoal;
In
tetrahydrofuran; methanol; dichloromethane; ethyl acetate; toluene;
DOI:10.1021/jo9713621