This manuscript describes the preparation of heterocyclic compounds such as naphtho[1,3]-dioxoles (3a-h), [1,4]-dioxines (4a-h), [1,4]-dioxepines (5a-c), [1,4]-dioxocines (6a-c) and diethyl 2-(2-ethoxy-2-oxoethyl)naphtho[1,3]dioxoles (8a-f). These heterocyclic compounds have been achieved by the reaction of benzoxepine-4-carboxylates (1a-h) with dihaloalkanes (2a-e) and activated alkyne (7a) for the
A new BF3·OEt2-catalyzed approach was developed for the construction of 2,2′-spirobi-2H-1-benzopyrancarboxylates by reacting ethyl 2-(chloromethyl)-2-hydroxy-2H-chromene-3-carboxylates with salicylaldehydes. The reactions proceeded through the formation of C–C and C–O bonds in one pot. Structure assignment of compound 3c was confirmed by single crystal X-ray analysis.
2-(氯甲基)-2-羟基-2 H-色烯-3-羧酸乙酯反应开发了一种新的BF 3 ·OEt 2催化方法用于构建2,2'-螺双-2 H -1-苯并吡喃羧酸盐与水杨醛。反应通过在一锅中形成C-C和C-O键进行。通过单晶 X 射线分析证实了化合物3c的结构分配。