Reactions of 3-acylchromones with dimethyl 1,3-acetonedicarboxylate and 1,3-diphenylacetone: one-pot synthesis of functionalized 2-hydroxybenzophenones, 6H-benzo[c]chromenes and benzo[c]coumarins
作者:Viktor O. Iaroshenko、Iryna Savych、Alexander Villinger、Vyacheslav Ya. Sosnovskikh、Peter Langer
DOI:10.1039/c2ob07020k
日期:——
Reactions of 3-methoxalyl-, 3-polyfluoroacyl- and 3-aroylchromones with dimethyl 1,3-acetonedicarboxylate and 1,3-diphenylacetone in the presence of DBU proceed at the C-2 atom of the chromone system with pyrone ring-opening and subsequent formal [3 + 3] cyclocondensation to functionalized 2-hydroxybenzophenones, 6H-benzo[c]chromenes and benzo[c]coumarins, depending on the substituent at the 3-position. An NMR study and X-ray crystallographic analysis are reported. The compounds synthesized can be considered as promising scaffolds for the design of the novel UV-A/B and UV-B filters.
在 DBU 的存在下,3-甲氧基丙酰基、3-多氟酰基和 3-芳酰基色酮与 1,3-丙酮二羧酸二甲酯和 1、在 DBU 的存在下,在色酮体系的 C-2 原子上进行吡酮开环,随后根据 3 位上的取代基的不同,进行形式上的 [3 + 3] 环缩合,生成官能化的 2-羟基二苯甲酮、6H-苯并[c]色烯和苯并[c]香豆素。报告中介绍了核磁共振研究和 X 射线晶体学分析。合成的化合物可被视为设计新型紫外线-A/B 和紫外线-B 过滤器的有前途的支架。