Tunable Phosphine-Triggered Cascade Reactions of MBH Derivatives and 3-Acyl-2<i>H</i>-chromen-2-ones: Highly Selective Synthesis of Diverse Chromenones
作者:Wei Yuan、Hu-Fei Zheng、Zhi-Hua Yu、Zi-Long Tang、De-Qing Shi
DOI:10.1002/ejoc.201301358
日期:2014.1
Diversechromenones were synthesized through tunable phosphine-mediated cascadereactions between 3-acyl-2H-chromen-2-ones and Morita–Baylis–Hillman (MBH) derivatives. With different phosphine loadings and reaction temperatures, MBHderivatives act either as C1 or C3 synthons for the construction of potential biologically active 3-dihydrofuran-fused chromen-2-ones, 4-allyl-3-acyl-chromen-2-ones, or
A Regioselective Metal-Free Construction of 3-Aroyl Coumarins by Csp2-H Functionalization
作者:Farnaz Jafarpour、Masoumeh Abbasnia
DOI:10.1021/acs.joc.6b02051
日期:2016.12.2
A successive metal-free TBHP-mediated regioselective C-H functionalization of coumarins toward expedient synthesis of 3-aroyl coumarins is unveiled. The ongoing method conducted through the reaction of either coumarins or coumarin-3-carboxylic acids with aromatic aldehydes. The optimized reaction condition also worked well with benzyl alcohols and styrenes as surrogates for aldehydes, which bear latent carbonyl functionality.
Co-initiator compositions for photopolymerization containing 3-acyl-substituted coumarins, photopolymerizable composition and photographic element
申请人:EASTMAN KODAK COMPANY
(a New Jersey corporation)
公开号:EP0022188B1
公开(公告)日:1984-10-03
Stabilized Sulfur Ylide Mediated Cyclopropanations and Formal [4+1] Cycloadditions of 3-Acyl-2<i>H</i>-chromenones and Their Imines
作者:Xiang-Suo Meng、Shan Jiang、Xiao-Yun Xu、Qiang-Xian Wu、Yu-Cheng Gu、De-Qing Shi
DOI:10.1002/ejoc.201600759
日期:2016.10
Stabilizedsulfurylidemediatedcyclopropanation and formal [4+1] cycloaddition of 3-acyl-2H-chromenones and their imines were explored. The transformations could be performed under mild conditions and were shown to have wide substrate scopes and significant functional-group tolerance; furthermore, the reactions proceeded with excellent regioselectivity. Thus, they are powerful methods for the one-pot
Regioselective Coupling Reactions of Coumarins with Aldehydes or Di-<i>tert</i>-butyl Peroxide (DTBP) through a C(sp<sup>2</sup>)-H Functionalization Process
have developed two new couplingreactions that involve coumarins and either aldehydes or di-tert-butyl peroxide (DTBP) in the presence of inexpensive copper or iron catalysts. Both of these reactions proceed through a C(sp2)–H functionalization process to regioselectivity generate keto- or methyl-substituted coumarin derivatives in moderate to good yields These couplingreactions will enrich current coumarin