Multi-step reaction with 11 steps
1.1: azidotrimethylsilane / (S,S)-Jacobsen Cr(salen) catalyst / diethyl ether / 144 h
1.2: 1S-(+)-10-camphorsulfuric acid / methanol / 0.5 h
2.1: NaH / tetrahydrofuran / 0.5 h / 20 °C
2.2: 88 percent / tetramethylammonium iodide / tetrahydrofuran / 0.5 h / 20 °C
3.1: 98 percent / H2 / Pd/C / methanol / 12 h / 20 °C
4.1: 73 percent / NaBH3CN; molecular sieves 4 Angstroem / methanol; acetic acid / 1 h / 20 °C / pH 6 - 7
5.1: 81 percent / Et3N / CH2Cl2 / 12 h / 20 °C
6.1: 91 percent / H2 / Pd/C / methanol / 12 h / 20 °C
7.1: Dess-Martin periodinane; pyridine / CH2Cl2 / 0.5 h / 20 °C
8.1: n-BuLi / benzene; hexane / 1 h / 20 °C
8.2: 94 percent / benzene; hexane / 5 h / 20 °C
9.1: TBAF / tetrahydrofuran / 12 h / 20 °C
10.1: 92.8 mg / tetrahydrofuran / 2 h
11.1: 94 percent / trifluoroacetic acid / CH2Cl2 / 0.17 h / 20 °C
With
pyridine; n-butyllithium; trimethylsilylazide; 4 A molecular sieve; tetrabutyl ammonium fluoride; hydrogen; sodium hydride; sodium cyanoborohydride; Dess-Martin periodane; triethylamine; trifluoroacetic acid;
palladium on activated charcoal; (S,S)-Jacobsen Cr(salen) catalyst;
In
tetrahydrofuran; methanol; diethyl ether; hexane; dichloromethane; acetic acid; benzene;
7.1: Dess-Martin oxidation / 8.1: Wittig reaction;
DOI:10.1021/ol016799g