An efficient and catalyst free protocol has been disclosed for aza-Michael addition reaction of pyrazoles with 2-aryl-3-nitro-2H-chromene derivatives, which provides synthetically important 4-pyrazole-3-nitrobenzopyrans at room temperature. In this one-pot transformation, good to excellent yield of the products up to 84% were obtained and generated a new CN bond. The relative configuration of the product
已经公开了一种有效且无催化剂的方案,用于
吡唑与 2-芳基-
3-硝基-2 H-色烯衍
生物的氮杂迈克尔加成反应,其在室温下提供了合成重要的 4-
吡唑-3-
硝基苯并
吡喃。在这种一锅法转化中,获得了高达 84% 的产品产率,并产生了新的 C N 键。产品的相对构型通过单晶 X 射线晶体学进行表征。该协议广泛适用于广泛的底物范围、高产率、易于访问以及无碱和无催化剂条件。