Expeditious Synthesis of 2,3,6-Trisubstituted 2H-1,3-Oxazin-4(3H)-ones via the Tertiary Amine-Induced Reaction of 2-Diazo-3-oxoalkanals and Imines Under Mild Conditions
作者:Jiaxi Xu、Hengzhen Qi、Jiantao Zhang
DOI:10.1055/s-0030-1258439
日期:2011.3
A series of 2,3,6-trisubstituted 2H-1,3-oxazin-4(3H)-one derivatives were conveniently synthesized in satisfactory to good yields by the reaction of imines with 2-diazo-3-oxoalkanals in the presence of a catalytic amount of a tertiary amine during several seconds under mild condition. Different bases and α-diazo-β-dicarbonyl compounds were also evaluated and a reaction mechanism is proposed. Compared with the corresponding thermal- and photo-induced reactions, the current method is a metal-free, mild, highly regioselective, and more efficient approach for the synthesis of 2H-1,3-oxazin-4(3H)-one derivatives.
一系列2,3,6-三取代的2H-1,3-噁嗪-4(3H)-酮衍生物通过在温和条件下,几秒钟内,利用少量三烰基胺作为催化剂,使亚胺与2-重氮-3-氧代烷醛反应,方便地合成,产率令人满意至良好。研究了不同的碱和α-重氮-β-二羰基化合物,并提出了反应机理。与相应的热引发和光引发反应相比,目前的方法是一种无金属、温和、高度区域选择性且更高效的合成2H-1,3-噁嗪-4(3H)-酮衍生物的方法。