Reaktion #6393

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

allyl trichloroacetimidate

Trifluoromethanesulfonic acid

→

title compound

17-Ethyl-1,14-dihydroxy-12-[2'-(4"-allyloxy-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

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONto mix for 5 minutes
2. 2
   SonstigeAfter 18 hours the reaction was quenched by the addition of saturated sodium bicarbonate
3. 3
   Extraktionextracted with ethyl acetate (3×5 ml)
4. 4
   WaschenThe combined organics were washed with brine
5. 5
   Trocknendried over magnesium sulfate
6. 6
   SonstigePurification of the
7. 7
   Einengenconcentrate by flash chromatography on silica gel (ethyl acetate:hexane (1:2)+1% methanol)

Vorschrift

To a 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 in 3.0 ml 33% methylene chloride in cyclohexane), allyl trichloroacetimidate (88 μl neat) was added and the reagents allowed to mix for 5 minutes. Trifluoromethanesulfonic acid (4.5 μl neat) was added slowly via syringe and the mixture stirred at room temperature. After 18 hours the reaction was quenched by the addition of saturated sodium bicarbonate and extracted with ethyl acetate (3×5 ml). The combined organics were washed with brine and dried over magnesium sulfate. Purification of the concentrate by flash chromatography on silica gel (ethyl acetate:hexane (1:2)+1% methanol) gave the title compound (156 mg).

Quelle