作者:Shoko Yamazaki、Kuriko Yamada、Kagetoshi Yamamoto
DOI:10.1039/b307194d
日期:——
Lewis acid-promoted cyclizations of heteroatom-substituted enynes have been examined. The reaction of enynes 3 and 7 bearing silicon substituents on an alkyne afforded the halogenated five-membered γ-lactones 4 and γ-lactams 8 as the main products. The reaction of substrates 15 and 16 having 2-phosphonoacrylate instead of malonate also gave halogenated five-membered cyclic compounds 17 and 18 as the major products. The cyclized products are highly substituted and potentially useful for further synthetic transformations.
Lewis酸促进的含杂原子取代的烯炔的环化反应已被研究。具有炔基硅取代基的烯炔3和7的反应主要生成卤代的五元γ-内酯4和γ-内酰胺8。底物15和16具有2-膦酸酯而非丙二酸酯,它们反应后同样主要生成卤代的五元环状化合物17和18。这些环化产物高度取代,潜在具有用于进一步合成转化的价值。