Multi-step reaction with 16 steps
1.1: NaH / tetrahydrofuran / 0.5 h / 20 °C
1.2: 76 percent / tetrahydrofuran / 0.67 h / 0 °C
2.1: (COCl)2; DMSO; Et3N / CH2Cl2 / -78 - 20 °C
3.1: Mg / tetrahydrofuran / Heating
3.2: 37.2 g / tetrahydrofuran / 0.08 h / 0 °C
4.1: 44 percent / 4 Angstroem molecular sieves; (+)-dicyclohexyl tartrate; Ti(O-iPr)4 / t-BuOOH / CH2Cl2 / 48 h / -20 °C
5.1: NaH / tetrahydrofuran / 0.5 h / 0 °C
5.2: 96 percent / tetrahydrofuran / 0 - 20 °C
6.1: Et3N; pivaloyl chloride / diethyl ether / 1 h / -78 - 0 °C
6.2: 81 percent / n-BuLi / tetrahydrofuran; diethyl ether / 0.5 h / 0 °C
7.1: NaN(SiMe3)2 / tetrahydrofuran / 1 h / -78 °C
7.2: 70 percent / dimethylsulfoxide / -78 - -45 °C
8.1: 86 percent / LiBH4 / methanol; diethyl ether; tetrahydrofuran / 1 h / 0 °C
9.1: (COCl)2; DMSO; Et3N / CH2Cl2 / -78 - 20 °C
10.1: t-BuOK / tetrahydrofuran / 1 h / 20 °C
10.2: 1.83 g / tetrahydrofuran; toluene
11.1: 95 percent / n-Bu4BF / tetrahydrofuran / 1 h
12.1: 87 percent / Jones reagent / acetone; H2O / 0.75 h / 15 °C
13.1: (COCl)2; DMF / CH2Cl2 / 1 h
14.1: n-BuLi / tetrahydrofuran; hexane / 0.5 h / -78 °C
14.2: 3.93 g / tetrahydrofuran; hexane / 0.75 h / -78 °C
15.1: 81 percent / TiCl4; (-)-sparteine; N-methylpyrrolidinone / CH2Cl2 / -78 - 0 °C
16.1: 88 percent / Et3N; DMAP / CH2Cl2 / 1.5 h / 0 °C
With
1-methyl-pyrrolidin-2-one; titanium(IV) isopropylate; dmap; lithium borohydride; n-butyllithium; jones reagent; oxalyl dichloride; (+)-dicyclohexyl tartrate; 4 A molecular sieve; n-Bu4BF; potassium tert-butylate; sodium hexamethyldisilazane; pivaloyl chloride; titanium tetrachloride; sodium hydride; magnesium; dimethyl sulfoxide; triethylamine; N,N-dimethyl-formamide; (-)-sparteine;
tert.-butylhydroperoxide;
In
tetrahydrofuran; methanol; diethyl ether; hexane; dichloromethane; water; acetone;
3.2: Grignard reaction / 4.1: Sharpless kinetic resolution / 10.2: Wittig methylenation / 12.1: Jones oxidation;
DOI:10.1021/ol061073b