Multi-step reaction with 18 steps
2: (COCl)2, Et3N / dimethylsulfoxide / -50 - 0 °C
3: t-BuOK / tetrahydrofuran / -78 °C
4: DIBAL / CH2Cl2 / -78 °C
5: Ti(OiPr)4, D-(-)DIPT, t-BuOOH, 4A molecular sieves / CH2Cl2 / -25 °C
6: 82 percent / Sncl4 / CH2Cl2 / -90 °C
7: CSA / acetone
8: 1.) O3, NaHCO3; 2.) NaOMe / 1.) CH2Cl/MeOH, -78 deg C; 2.) MeOH
9: Ph3P, CBr4 / CH2Cl2 / 0 °C
10: 1.) n-BuLi / 1.) THF, -78 deg C; 2.) HMPA, from -78 to 0 deg C
11: Li, NH3 / 2-methyl-propan-2-ol / -33 °C
12: MeOH / p-TsOH
13: CSA
14: imidazole / dimethylformamide
15: DIBAL / toluene
16: (COCl)2, Et3N / CH2Cl2 / -50 - 0 °C
17: t-BuOK / tetrahydrofuran / -78 °C
18: p-TsOH / methanol
With
1H-imidazole; titanium(IV) isopropylate; methanol; tert.-butylhydroperoxide; n-butyllithium; oxalyl dichloride; carbon tetrabromide; 4 A molecular sieve; potassium tert-butylate; ammonia; sodium methylate; tin(IV) chloride; lithium; diisobutylaluminium hydride; sodium hydrogencarbonate; D-(-)-diisopropyl tartrate; ozone; triethylamine; triphenylphosphine;
camphor-10-sulfonic acid; toluene-4-sulfonic acid;
In
tetrahydrofuran; methanol; dichloromethane; dimethyl sulfoxide; N,N-dimethyl-formamide; acetone; toluene; tert-butyl alcohol;
DOI:10.1016/S0040-4039(01)80524-4