An Effective System to Synthesize Hypolipidemic Active α-Asarone and Related Methoxylated (<i>E</i>)-Arylalkenes
作者:Anuj Sharma、Bhupendra P. Joshi、Arun K. Sinha
DOI:10.1246/bcsj.77.2231
日期:2004.12
Methoxylated (E)-arylalkenes (1a–1k) were prepared in two steps by an improved Grignard reaction comprising the reverse addition of alkylmagnesium bromide to benzaldehydes (2a–2k) in anhydrous ether and toluene into arylalkanols (3a–3k) in high yield, followed by dehydration with silica gel under microwave irradiation for 3–12 min, depending upon the substituents attached to the aromatic ring to afford hypolipidemic active α-asarone (1a) and related methoxylated (E)-arylalkenes (1b–1k).
通过改进的Grignard反应,分两步制备了甲氧基化(E)-芳基烯烃(1a-1k)。该反应包括在无水乙醚和甲苯中反向加成烷基镁溴化物至苯甲醛(2a-2k),高产率地转化为芳基醇(3a-3k),随后在微波辐射下,根据芳香环上取代基的不同,利用硅胶进行脱水处理3-12分钟,得到具有降脂活性的α-细辛素(1a)及相关甲氧基化(E)-芳基烯烃(1b-1k)。