Multi-step reaction with 9 steps
1: NaH / dimethylformamide / 72 h
2: 3.92 g / NaH / tetrahydrofuran / 1 h
3: porcine liver esterase; aq. phosphate buffer / dimethylsulfoxide / 168 h / 20 °C / pH 8.0
4: 77 percent / 1,3-dicyclohexylcarbodiimide; DMAP / CH2Cl2 / 72 h / 20 °C
5: aq. KOH / methanol / 15 h / 45 °C
6: 1.08 g / cyanuric fluoride; pyridine / CH2Cl2 / 1 h / 0 °C
7: 63 percent / hexamethyldisilazane; n-BuLi / diethyl ether / 0 - 20 °C
8: 78 percent / aq. NaCl / dimethylsulfoxide / 20 h / 125 °C
9: 36 percent / NaBH4 / methanol / 2.5 h / 0 °C
With
pyridine; porcine liver esterase; dmap; potassium hydroxide; sodium tetrahydroborate; n-butyllithium; trifluoro-[1,3,5]triazine; phosphate buffer; sodium hydride; dicyclohexyl-carbodiimide; 1,1,1,3,3,3-hexamethyl-disilazane; sodium chloride;
In
tetrahydrofuran; methanol; diethyl ether; dichloromethane; dimethyl sulfoxide; N,N-dimethyl-formamide;
8: Krapcho decarboxylation;
DOI:10.1002/anie.200461327