Herein is reported an efficient method for the synthesis of 2,2-dimethyl-2H-chromenes in a single step from the corresponding phenol and 3-methyl-2-butenal via microwave irradiation in CDCl3. This protocol features a mild reaction environment (neutral, no added catalyst) which yields regioselective formation of the chromene and displays tolerance toward acid- and base-sensitive protecting groups.
本文报道了一种有效的方法,该方法通过一步法在CDCl 3中由相应的
苯酚和
3-甲基-2-丁烯醛一步合成2,2-二甲基-2 H-色烯。该方案具有温和的反应环境(中性,不添加催化剂),可形成色烯的区域选择性形成,并显示出对酸和碱敏感保护基的耐受性。