Synthesis of l-Octaarginine through Microencapsulated Palladium-Catalyzed Allyl Ester Deprotection
摘要:
Octaarginine has been described as a molecular transporter. We report a useful synthesis of orthogonally protected L-octaarginine by using a method based on a microencapsulated palladium catalyst. Known palladium-based methods for allyl ester deprotection have been modified to facilitate purification of the unprotected intermediates. This improvement in the purification step has also been tested with a variety of allyl alpha-amino esters and allyl alpha,beta-unsaturated esters.
Aromatic substituent effects in palladium-catalyzed intramolecular olefin oxyarylation reactions
作者:Mark C. Maust、Zacary L. Croft、Mackenzie W. Sullivan、Ross L. Dove、Emily E. Hardy、W.E. Brenzovich
DOI:10.1016/j.tetlet.2020.151674
日期:2020.3
The effect of electron-donating groups on the palladium-catalyzedintramolecular oxyarylation reaction was studied. In the case of activation at the ortho-position, the reaction favors the formation of a tricyclic lactone via C-H insertion. However, when the ipso-position is activated, the major product is instead a novel α,β-unsaturated lactone formed by way of a stabilized phenonium intermediate
Direct transformation of benzyl esters into esters, amides, and anhydrides using catalytic ferric(<scp>iii</scp>) chloride under mild conditions
作者:Van Hieu Tran、Truong Giang Luu、Anh Thu Nguyen、Hee-Kwon Kim
DOI:10.1039/d3ob01443f
日期:——
FeCl3 were employed as the chlorinating agent and catalyst respectively to convert benzyl esters into acid chloride intermediates, which directly reacted with alcohols, amines, and carboxylic acids. Various esters, amides, and anhydrides were readily obtained with high yields undermildconditions. This method is promising for the practical synthesis of esters, amides, and anhydrides from benzyl esters
In situ synthesis of 2-allyloxy-1-methylpyridinium triflate for the allylation of carboxylic acids
作者:Timothy A. Strayer、Caleb C. Culy、Matthew H. Bunner、Amie R. Frank、Philip A. Albiniak
DOI:10.1016/j.tetlet.2015.10.085
日期:2015.12
2-Allyloxypyridinium triflate is formed in situ by treating a mixture of 2-allyloxypyridine, a carboxylic acid, and toluene with methyl triflate. Subsequent warming of the reaction mixture in the presence of potassium carbonate leads to efficient formation of ally! esters in good to excellent yields. (C) 2015 Elsevier Ltd. All rights reserved.
The Rearrangement of Allyl 9-Fluorenecarboxylate
作者:Richard T. Arnold、William E. Parham、R. M. Dodson
DOI:10.1021/ja01175a059
日期:1949.7
Dialkylaminoalkyl Esters of Trisubstituted Acetic Acids
作者:A. A. Larsen、A. Wayne. Ruddy、B. Elpern、Mildred. MacMullin