Counterattack Mode Differential Acetylative Deprotection of Phenylmethyl Ethers: Applications to Solid Phase Organic Reactions
摘要:
A counterattack protocol for differential acetylative cleavage of phenylmethyl ether has been developed. The phenylmethyl moiety is liberated as benzyl bromide that is isolated and reused providing advantages in terms of waste minimization/utilization and atom economy. The applicability of this methodology has been extended for solid phase organic reactions with the feasibility of reuse of the solid support.
An extremely fast and efficient acylation reaction of alcohols with acid anhydrides in the presence of trimethylsilyl trifluoromethanesulfonate as catalyst
作者:Panayiotis A. Procopiou、Simon P. D. Baugh、Stephen S. Flack、Graham G. A. Inglis
DOI:10.1039/cc9960002625
日期:——
Alcohols are converted to esters in a fast, clean and efficient reaction with acid anhydrides in the presence of trimethylsilyl trifluoromethanesulfonate.
在三甲基硅基三氟甲磺酸盐的存在下,醇与酸酐发生快速、干净且高效的酯化反应。
Electrostatic catalysis by ionic aggregates: scope and limitations of Mg(ClO4)2 as acylation catalyst
作者:Asit K Chakraborti、Lalima Sharma、Rajesh Gulhane、Shivani
DOI:10.1016/j.tet.2003.08.007
日期:2003.9
Alkali and alkaline earthmetal perchlorates exhibit electrostatic catalysis in the activation of anhydrides for the acylation reaction. Perchlorates with higher values of the charge-size function of the metal ion exhibit better catalytic activity following the order Mg(ClO4)2>Ba(ClO4)2>LiClO4. Acylation of structurally diverse phenols, thiols, alcohols, and amines have been carried out with stoichiometric
4-(<i>N</i>,<i>N</i>-Dimethylamino)pyridine-Embedded Nanoporous Conjugated Polymer as a Highly Active Heterogeneous Organocatalyst
作者:Yuan Zhang、Yong Zhang、Ya Lei Sun、Xin Du、Jiao Yi Shi、Wei David Wang、Wei Wang
DOI:10.1002/chem.201103028
日期:2012.5.14
We report herein for the first time the incorporation of a versatile organocatalyst, 4‐(N,N‐dimethylamino)pyridine (DMAP), into the network of a nanoporousconjugatedpolymer (NCP) by the “bottom‐up” approach. The resulting DMAP‐NCP material possesses highly concentrated and homogeneously distributed DMAP catalytic sites (2.02 mmol g−1). DMAP‐NCP also exhibits enhanced stability and permanent porosity
我们在此首次报道了一种通过“自下而上”的方法将多用途有机催化剂4-(N,N-二甲基氨基)吡啶(DMAP)掺入纳米多孔共轭聚合物(NCP)的网络中。所得的DMAP-NCP材料具有高度浓缩且均匀分布的DMAP催化位点(2.02 mmol g -1)。由于强大的共价键和“自下而上”的单体的刚性,DMAP-NCP还表现出增强的稳定性和永久孔隙率。结果,DMAP-NCP在醇的酰化反应中显示出极好的催化活性,产率为92–99%。该DMAP-NCP可以容易地从反应混合物中回收催化剂,并在至少14个连续循环中重复使用,而活性没有明显的损失。此外,催化酰化反应可以在纯净和连续流动条件下进行至少536小时,且具有相同的催化剂活性。
Hybrid interaction network of guanidinium–biphenyldisulfonic acid for the structure determination of liquid molecules
co-crystallization of liquid compounds 1–8 [isoeugenol (1), (−)-isopulegeol (2), eugenol acetate (3), trans-anethole (4), p-anisaldehyde (5), methyl isoeugenol (6), 2,6-dimethylaniline (7), and (1R)-(−)-menthyl acetate) (8)], and their structures were determined by single crystal X-ray diffraction. These liquid compounds were found to be caught in the cavity or channels of GBPS through hybrid interactions including
Structure determination of liquid molecules by encapsulation in an aromatic cavity with hydrogen bonding and enhanced C–H⋯π interactions
作者:Shu-Qin Qin、Wei Xu、Wen-Cai Ye、Ren-Wang Jiang
DOI:10.1039/d2ce01033j
日期:——
NH2+ can be used as a hydrogen bond donor, and SO3− can be used as a hydrogen bond acceptor; (iii) the co-planar naphthalene rings can form aromatic interactions with guest molecules. The liquid guests 1–8 [(−)-isopulegol (1), (−)-menthyl acetate (2), isoeugenol (3), 2,6-dimethylaniline (4), methyleugenol (5), 2,6-diisopropylaniline (6), methyl salicylate (7) and L(−)-carvone (8)] are successfully