The synthesis of a newfluorescentsensor incorporating a fluorinated indolizine unit bound to 6-amino-β-cyclodextrin by two different synthetic ways is described. Its sensingability toward adamantanol has been demonstrated.
Scope and Limitations of the Intermolecular Furan-Yne Cyclization
作者:Anna Zeiler、Michael J. Ziegler、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/adsc.201500081
日期:2015.5.4
Different types of alkynes were reacted with 2,5‐disubstituted furans in order to evaluate the scope of the intermolecular furan‐yne reaction. With ethynyl aryl ethers as starting materials, 2‐phenoxy phenols were accessible in moderate to good yields. A different reaction mode was observed for alkynes bearing electron‐withdrawing substituents. For these starting materials a cis‐selective hydroarylation
A Simple Method for the Preparation of Substituted Phenoxyacrylic Acid Phenyl Esters
作者:Ewa Bialecka-Florjańczyk
DOI:10.1080/00397910008087068
日期:2000.12.1
Abstract A simple and efficient synthesis of phenoxyacrylic acid phenyl esters via one pot esterification and Michael-type addition starting from propynoic acid and an excess of an appropriate phenol is described.
Esters as Alkynyl Acyl Ammonium and Azolium Precursors: A Formal [2 + 3] Annulation with Amidomalonates via Lewis Base/Lewis Acid Cooperative Catalysis
作者:Jing Cao、Kewen Sun、Shuding Dong、Tao Lu、Ying Dong、Ding Du
DOI:10.1021/acs.orglett.7b03453
日期:2017.12.15
Esters are for the first time used as α,β-unsaturated alkynyl acyl ammonium and azolium precursors to undergo a formal [2 + 3] annulation with amidomalonates through DMAP/LiCl or carbene/LiCl cooperative catalysis. A wide range of (Z)-5-amino-3-furanones were obtained in moderate to high yields with high regioselectivity and stereoselectivity. In addition, a plausible mechanism based on the calculated
How Much Does the Hybridization of a Carbon Atom Affect the Transmission of the Substituent Effect on the Chemical Shift?
作者:Eun Jeong Jeong、In-Sook Han Lee
DOI:10.1002/bkcs.10067
日期:2015.1
systematically examined to find out the substituent effect on the chemical shift. The values of the chemical shift of the carbonyl carbon showed an inverse correlation with the Hammett σ values, and the magnitude of the slope was the largest with the propiolates. The α carbons of acrylates and propiolates also showed an inverse correlation with much smaller values of the slopes than those of the carbonyl carbons;
1 H和13系统检查了丙酸,丙烯酸和丙酸的芳基酯的13 C NMR光谱,以了解取代基对化学位移的影响。羰基碳的化学位移值与Hammettσ值呈反比关系,且斜率的大小与丙酸酯的比值最大。丙烯酸酯和丙酸酯的α碳也显示出负相关,其斜率值比羰基碳小得多。但是那些丙酸的人绝对没有关联。但是,丙烯酸酯和丙酸酯的β碳与较大的斜率值呈正相关。斜率的符号和大小可以通过取代基电子效应通过键和空间的传递来理解。苯环的13 C化学位移值。