Reactions of salicyl N-tosylimines or salicylaldehydes with diethyl acetylenedicarboxylate for the synthesis of highly functionalized chromenes
摘要:
Reactions of diethyl acetylenedicarboxylate with salicyl N-tosylimines or salicylaldehydes proceeded smoothly in the presence of DABCO or dimethylphenylphosphine under mild conditions to give the corresponding chromenes in excellent yields. (c) 2006 Elsevier Ltd. All rights reserved.
Lactic acid as an invaluable bio-based solvent for organic reactions
作者:Jie Yang、Jia-Neng Tan、Yanlong Gu
DOI:10.1039/c2gc36083g
日期:——
3-dicarbonyl compounds. In these reactions, lactic acidsolvent exhibited many advantages including bio-based origin, superior synthetic efficiency, ease of isolating the product and good recyclability of the reaction medium. The concept of using lactic acid as a green solvent not only enriches the diversity and versatility of bio-based green solvents, but also offers us an effective means for designing
An efficient synthetic method was developed for the selective construction of 2H-chromene derivatives from various salicylaldehydes and acetylenic diesters using a dual catalyst system (p-toluenesulfonic acid monohydrate and pyrrolidine). The advantages of this transformation include high selectivity, good functional group tolerance, operational simplicity, and mild reaction conditions.
Reactions of salicyl N-tosylimines or salicylaldehydes with diethyl acetylenedicarboxylate for the synthesis of highly functionalized chromenes
作者:Ying-Wen Guo、Yong-Ling Shi、Hong-Bin Li、Min Shi
DOI:10.1016/j.tet.2006.04.011
日期:2006.6
Reactions of diethyl acetylenedicarboxylate with salicyl N-tosylimines or salicylaldehydes proceeded smoothly in the presence of DABCO or dimethylphenylphosphine under mild conditions to give the corresponding chromenes in excellent yields. (c) 2006 Elsevier Ltd. All rights reserved.