Reaktion #952749

Reaktionsgleichung

17-ethyl-1,14-dihydroxy-12-[2'-(4"-hydroxy-3"-methoxycyclohexyl)-1'-methylvinyl]-23,25-dimethoxy-13,19,21,27-tetramethyl-11,28-dioxa-4-azatricyclo[22.3.1.04,9 ]octacos-18-ene-2,3,10,16-tetraone

boron trifluoride etherate

ethyl diazoacetate

→

17-ethyl-1,14-dihydroxy-12-[2'-(4"-(ethoxycarbomethoxy)-3"-methoxycyclohexyl)-1'-methylvinyl]-23,25-dimethoxy-13,19,21,27-tetramethyl-11,28-dioxa-4-azatricyclo[22.3.1.04,9 ]octacos-18-ene-2,3,10,16-tetraone

Ausbeute 38.5%

Lösungsmittel

diethyl ether

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe reaction mixture was quenched with saturated aqueous NaHCO3
2. 2
   Extraktionextracted 4× with CH2Cl2
3. 3
   Trocknendried over anhydrous Na2SO4
4. 4
   FiltrationThe mixture was filtered
5. 5
   Einengenconcentrated in vacuo
6. 6
   SonstigeThe products were isolated by preparative TLC on silica gel (3:2 EtOAc/hexanes)
7. 7
   Waschena second preparative TLC (eluted 2× with 3:1 hexanes/acetone)

Vorschrift

To a stirred solution of 17-ethyl-1,14-dihydroxy-12-[2'-(4"-hydroxy-3"-methoxycyclohexyl)-1'-methylvinyl]-23,25-dimethoxy-13,19,21,27-tetramethyl-11,28-dioxa-4-azatricyclo[22.3.1.04,9 ]octacos-18-ene-2,3,10,16-tetraone (200 mg., 0.253 mmol., 1 eq.) in diethyl ether (6 mL.) was added boron trifluoride etherate (0.009 mL., 0.073 mmol., 0.3 eq.) and ethyl diazoacetate (0.080 mL., 0.760 mmol., 3 eq.). The reaction mixture was stirred 12 h. The reaction mixture was quenched with saturated aqueous NaHCO3 and extracted 4× with CH2Cl2. The organic extracts were combined and dried over anhydrous Na2SO4. The mixture was filtered and concentrated in vacuo. The products were isolated by preparative TLC on silica gel (3:2 EtOAc/hexanes) and a second preparative TLC (eluted 2× with 3:1 hexanes/acetone) affording 24.7 mg of 17-ethyl-1,14-dihydroxy-12-[2'-(4"-(ethoxycarbomethoxy)-3"-methoxycyclohexyl)-1'-methylvinyl]-23,25-dimethoxy-13,19,21,27-tetramethyl-11,28-dioxa-4-azatricyclo[22.3.1.04,9 ]octacos-18-ene-2,3,10,16-tetraone. (1H NMR, 13C NMR and mass spectral analysis were consistent with the desired structure).

Quelle