Multi-step reaction with 11 steps
1.1: 82 percent / CSA / CH2Cl2 / -10 - 20 °C
2.1: 65 percent / Ti(i-PrO)3Cl; i-PrMgCl / diethyl ether / 6 h
3.1: TBAF*H2O / dimethylformamide / 6 h / 75 °C
4.1: 0.131 g / i-Pr2NEt; DMAP / CH2Cl2 / 0 - 20 °C
5.1: Grubbs 2nd catalyst / toluene / 3 h / 60 °C
6.1: DIBAL-H / toluene / 0.25 h / -78 °C
7.1: n-BuLi / tetrahydrofuran; hexane / 0.08 h / 0 °C
7.2: 0.098 g / tetrahydrofuran; hexane / 1 h / -78 - 0 °C
8.1: 78 percent / DDQ; 4 Angstroem molecular sieves / CH2Cl2 / 0.5 h / 0 °C
9.1: DIBAL-H / CH2Cl2 / 3 h / 0 °C
10.1: Dess-Martin periodinane / CH2Cl2 / 0.75 h / 0 °C
11.1: BuLi / tetrahydrofuran; hexane / 0.5 h / -78 °C
11.2: tetrahydrofuran; hexane / 0.75 h / -78 - 0 °C
With
tricyclohexylphosphine[1,3-bis(2,4,6-trimethylphenyl)-4,5-dihydroimidazol-2-ylidine][benzylidene]ruthenium(II) dichloride; triisopropoxytitanium(IV) chloride; dmap; n-butyllithium; 4 A molecular sieve; camphor-10-sulfonic acid; tetrabutyl ammonium fluoride; isopropylmagnesium chloride; diisobutylaluminium hydride; Dess-Martin periodane; N-ethyl-N,N-diisopropylamine; 2,3-dicyano-5,6-dichloro-p-benzoquinone;
In
tetrahydrofuran; diethyl ether; hexane; dichloromethane; N,N-dimethyl-formamide; toluene;
7.2: Wittig olefination;
DOI:10.1021/ja0609708