Reaction of allyl and benzyl alcohols, and their toluene-p-sulphonates, with furan
作者:P. H. Boyle、J. H. Coy、H. N. Dobbs
DOI:10.1039/p19720001617
日期:——
furan in acetonitrile. The reaction is catalysed by lithium perchlorate. Some alcohols can react directly with furan under acidic conditions. Alcohols investigated include 2-benzylallyl alcohol (8), E-α-methylcinnamyl alcohol (2) and its p-nitro- and p-methoxy-derivatives, (1) and (3), benzyl alcohol, p-nitrobenzyl alcohol, and p-methoxybenzyl alcohol. Both geometrical isomers of α-methyl-p-nitrocinnamyl
2-烯丙基-呋喃酮和2-苄基-呋喃可以由能够产生稳定的碳离子的烯丙醇或苄醇制备。将该醇的甲苯磺酰基衍生物与呋喃在乙腈中回流。该反应由高氯酸锂催化。一些醇可以在酸性条件下与呋喃直接反应。研究的醇类包括2-苄基烯丙醇(8),E -α-甲基肉桂醇(2)及其对硝基和对甲氧基衍生物,(1)和(3),苄醇,对硝基苄醇和对甲氧基苄醇。α-甲基-p的两种几何异构体制备了硝基硝基肉桂醇(1)和(13),并通过化学和光谱法确定了它们的立体化学。但是,只有E-异构体(1)与呋喃反应。讨论了该反应的机理,并描述了实现1,3-偶极环加成的尝试。