α-Nitro Ketone Synthesis Using <i>N</i>-Acylbenzotriazoles
作者:Alan R. Katritzky、Ashraf A. A. Abdel-Fattah、Anna V. Gromova、Rachel Witek、Peter J. Steel
DOI:10.1021/jo051231x
日期:2005.11.1
Readily available N-acylbenzotriazoles 2a−l (derived from a variety of aliphatic, (hetero)aromatic, and N-protected α-amino carboxylic acids) smoothly convert primary 3a−c and α-functionalized primary nitroalkanes 3d into the corresponding α-nitro ketones 5a−p in yields of 39−86% (average 63%).
Efficient Preparation of Aminoxyacyl Amides, Aminoxy Hybrid Peptides, and α-Aminoxy Peptides
作者:Alan R. Katritzky、Ilker Avan、Srinivasa R. Tala
DOI:10.1021/jo901612j
日期:2009.11.20
N-(Pg-α-aminoxy acids) 1a−g are converted to N-(Pg-α-aminoxyacyl)benzotriazoles 2a−g, which react under mild conditions with amines, α-amino acids/α-dipeptides, and α-aminoxy acids to give aminoxyacyl amides 3a−g, (3e+3e′), and (3g+3g′), aminoxy hybrid peptides 4a−h, (4a+4a′), 6a−d, 9a−e, (9a+9a′), and (9b+9b′), and α-aminoxy peptides 10a,b in good yields without racemization.
Convenient and Efficient Preparation of N-Protected (α-Aminoacyl)oxy-Substituted Terpenes and Alkanes
作者:Alan Katritzky、Parul Angrish
DOI:10.1055/s-2006-950349
日期:——
Chiral N-protected (a-aminoacyl)oxy-substituted terpenes and alkanes, including diastereomeric analogues, are conveniently and efficiently prepared from the corresponding readily available chiral and racemic 1-[(benzyloxycarbonyl)amino]acyl}benzotriazoles under microwave irradiation with naturally occurring terpene alcohols or alkanols.
(α-Aminoacyl)amino-Substituted Heterocycles and Related Compounds
作者:Alan R. Katritzky、Bahaa El-Dien M. El-Gendy、Ekaterina Todadze、Ashraf A. A. Abdel-Fattah
DOI:10.1021/jo8007379
日期:2008.7.1
N-Protected-(aminoacyl)benzotriazoles 1a−e,g,i,j,1a′−c′ convert heterocyclic amines of the following series: thiazoles (3a and 3a′), benzothiazoles (3b and 3b′), benzimidazoles (3c and 3c′), thiadiazoles (3d), pyrimidones (9a,b,a′), pyrazoles (11a,b), and pyridines (13a−g, 13d′) under microwave irradiation, into N-substituted amides in yields of 40−98% (average 76%). N-Protected peptidoylbenzotriazoles
Alkyl, Unsaturated, (Hetero)aryl, and N-Protected α-Amino Ketones by Acylation of Organometallic Reagents
作者:Alan R. Katritzky、Khanh N. B. Le、Levan Khelashvili、Prabhu P. Mohapatra
DOI:10.1021/jo0614801
日期:2006.12.1
Stable and easily accessible N-acylbenzotriazoles, derived from a variety of aliphatic, unsaturated, (hetero)aromatic, and N-protected α-amino carboxylicacids, were reacted with Grignard and heteroaryllithium reagents to afford corresponding ketones in good to excellent yields.