反应详情

150 μl of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU, 1 mmol) are added to a solution of methyl 2-bromocyclooctene-3-glycolate 17 (0.5 mmol) in anhydrous DMSO at 60° C. After stirring for 15 min, an additional 600 μl of DBU (4 mmol) are added and then the combined mixture is stirred overnight at 60° C. The mixture is acidified with 1M HCl and extracted with AcOEt. The organic phase is filtered through a separating filter and is concentrated under vacuum. The cyclooct-1-yn-3-glycolic acid 18 is purified on a preparative plate (CH2Cl2/MeOH 9/1) and is obtained with a yield of 55% (w=50 mg).

1. stirringthe combined mixture is stirred overnight at 60° C
2. extractionextracted with AcOEt
3. filtrationThe organic phase is filtered through a separating
4. filtrationfilter
5. concentrationis concentrated under vacuum
6. customThe cyclooct-1-yn-3-glycolic acid 18 is purified on a preparative plate (CH2Cl2/MeOH 9/1)
7. customis obtained with a yield of 55% (w=50 mg)