with a stronger base such as NaOH, KOH and LiOH,afforded 2a in moderate yield, except with LiOH (Table 1,entries 3-5). The addition of CuI was deteriorative (Table 1,entry 6). Different solvents were screened in order to increasethe yield (Table 1, entries 7-10). The best result was obtainedwhen DMSO was used as a solvent (Table 1, entry 10). Thereaction time was reduced by using more base equivalentwith
使用更强的碱,如 NaOH、KOH 和 LiOH,以中等收率提供 2a,但 LiOH 除外(表 1,条目 3-5)。添加 CuI 会恶化(表 1,条目 6)。筛选不同的溶剂以提高产率(表 1,条目 7-10)。当使用
DMSO 作为溶剂时,获得了最好的结果(表 1,条目 10)。通过使用更多具有相似产率的碱当量来减少反应时间(表 1,条目 11)。产量减少到 100