Fluorogenic aldehydes bearing arylethynyl groups: turn-on aldol reaction sensors for evaluation of organocatalysis in DMSO
摘要:
Fluorogenic aromatic aldehydes bearing arylethynyl groups were developed. They were used for monitoring the reaction progress of organocatalytic aldol reactions in DMSO through an increase in the fluorescence intensity based on the formation of the florescent aldol product. The ratios of the fluorescence intensities of the aldols to the aldehydes were more than 300. These results suggest that the fluorescence assay system using the aldehyde is useful for the rapid identification of superior aldol catalysts and reaction conditions. (c) 2014 Elsevier Ltd. All rights reserved.
Mono- and dinuclear cyclopalladates as catalysts for Suzuki–Miyaura cross-coupling reactions in predominantly aqueous media
作者:G. Narendra Babu、Samudranil Pal
DOI:10.1016/j.tetlet.2017.01.089
日期:2017.3
Suzuki–Miyaura cross-coupling reactions of aryl halides with arylboronic acids were performed in predominantly aqueous media employing two mono- and two dinuclear cyclopalladated complexes as catalysts. These complexes are [Pd(HL)Cl] (I), [Pd(L)(PPh3)] (II), [Pd2(μ-dppb)(L)2] (III) and [Pd2(μ-dppf)(L)2] (IV); where H2L, dppb and dppf represent 4-methoxy-N′-(mesitylidene)benzohydrazide, 1,4-bis(dip
An easily prepared, air and moisture stable, resin-bound palladium catalyst for Suzuki cross-coupling reactions
作者:Tony Y. Zhang、Matthew J. Allen
DOI:10.1016/s0040-4039(99)01147-8
日期:1999.8
An air and moisture stable polymer supported palladium catalyst easily prepared from a commercial available thiourea resin Deloxan®THP was found to enable Suzuki cross-couplingreactions to be carried out in high yields and convenient manner.
Ceramic boron carbonitrides for unlocking organic halides with visible light
作者:Tao Yuan、Meifang Zheng、Markus Antonietti、Xinchen Wang
DOI:10.1039/d1sc01028j
日期:——
halides, with visible light irradiation. Cross-coupling of halides to afford new C–H, C–C, and C–S bonds can proceed at ambient reaction conditions. Hydrogen, (het)aryl, and sulfonyl groups were introduced into the arenes and heteroarenes at the designed positions by means of mesolytic C–X (carbon–halogen) bond cleavage in the absence of any metal-based catalysts or ligands. BCN can be used not only
A catalytic route toward chiral Morita–Baylis–Hillman esters by asymmetric coupling between α,β‐acetylenic esters, aldehydes, and trimethylsilyl iodide has been developed (see scheme). The reaction proceeds with high to excellent enantioselectivities, and the products can be transformed into β‐branched derivatives in a single step and with excellent retention of configuration. TMS=trimethylsilyl
Increased expression of efflux transport proteins confers the Multi DrugResistant (MDR) phenotype to drugresistant bacteria, which can be mitigated by effluxpumpinhibitors (EPI). EPI's have the dual advantage of restoring efficacy of antibiotics and retarding the evolution of drugresistant mutants. In this study, 17 heterocyclic derivatives synthesized by a polyethylenimine (PEI) catalyzed one-pot