Silver-catalysed multicomponent 1,3-dipolar cycloaddition of 2-oxoaldehydes-derived azomethine ylides
作者:Juan Mancebo-Aracil、Alberto Cayuelas、Carmen Nájera、José M. Sansano
DOI:10.1016/j.tet.2015.09.039
日期:2015.11
The silver-catalysed multicomponent reaction between ethyl glyoxylate, 2,2-dimethoxyacetaldehyde, or phenylglyoxal as aldehyde components with a α-amino ester hydrochloride and a dipolarophile in the presence of triethylamine is described. This domino process takes place at room temperature by in situ liberation of the α-amino ester followed by the formation of the imino ester, which is the precursor
描述了在三乙胺的存在下,乙醛酸乙酯,2,2-二甲氧基乙醛或苯乙醛作为醛组分与α-氨基酯盐酸盐和亲二苯醚之间的银催化多组分反应。这个过程多米诺在α氨基酯其次是亚氨基酯,其是metalloazomethine叶立德的前体的形成的原位解放需要在室温下通过地方。该物质和相应的双极性亲和剂的环加成得到多取代的脯氨酸衍生物。具有在代表dipolarophiles得到存在甘氨酸,丙氨酸,苯丙氨酸和苯基甘氨酸在室温下乙醛酸乙酯进行反应内切-2,5-顺-cycloadducts在良好的收益率和高diastereoselection。另外,2,2-二甲氧基乙醛与相同氨基酯和dipolarophiles评价中,相同的温和条件下,产生相应的内切-2,5-顺-cycloadducts具有比使用乙醛酸乙酯同一反应得到更高diastereoselections。在苯甲酰甲醛的情况下,相应的5-苯甲酰基内切-2,5-顺c