反应详情

5 g (0.0198 mol) of 11-tetrahydropyranyloxyundecyne of Example 7 were placed in a mixture of 50 ml of THF and 25 ml of hexamethylphosphoric triamide under an argon atmosphere. At -60° C., 12.4 ml (0.0198 mol) of n-butyllithium in hexane were added dropwise. After 30 min at -60° C., a solution of 9.0 g (0.0248 mol) of 1-bromoeicosane in 25 ml of THF was added dropwise at -60° C. The mixture was left to warm up to room temperature. After 18 h at room temperature, it was poured into 25% aqueous NaH2PO4 solution and extracted with n-heptane (3×). The combined organic phases were dried (Na2SO4) and the solvent was removed. Flash chromatography on silica gel (n-heptane/ethyl acetate =15:1) gave 6.5 g (61.3% of theory) of 1-tetrahydropyranyloxy-hentriacont-10-yne.

1. waitThe mixture was left
2. waitAfter 18 h at room temperature
3. extractionextracted with n-heptane (3×)
4. dry with materialThe combined organic phases were dried (Na2SO4)
5. customthe solvent was removed