已开发出一种铜 (II)/HOBt 催化合成二肽和“一般”酰胺的方法,使用微波辐射可显着加速反应。作为使用传统羧酸活化的替代方法,该方法依赖于使用 N-酰基咪唑作为活化的氨基伙伴。通过这样做,通过具有挑战性且研究较少的 N → C 方向合成,提出了一种非常规的方法来获得二肽和酰胺。已成功合成了一系列二肽和“通用”酰胺,并且该方法的适用性已在克级合成中得到说明。所提出的温和反应条件完全适合在敏感氨基酸存在下进行偶联,从而提供没有可检测到的外消旋作用的产物。此外,
<i>N</i>-Alkyl Carbamoylimidazoles as Isocyanate Equivalents: Exploration of the Reaction Scope for the Synthesis of Ureas, Hydantoins, Carbamates, Thiocarbamates, and Oxazolidinones
作者:Jazmin Bansagi、Cody Wilson-Konderka、Vincent Debrauwer、Pournima Narayanan、Robert A. Batey
DOI:10.1021/acs.joc.2c00803
日期:2022.9.2
methyl ester and carbamoylimidazoles. The reaction of carbamoylimidazoles with alcohols and thiols under basic conditions affords carbamates and thiocarbamates, respectively, in good yields. Lastly, a method for the preparation of chiral oxazolidinone heterocycles from chiral epoxy alcohols is demonstrated using a double displacement approach. The reactions occur with high regio- and stereoselectivity
Amino acid derived latent isocyanates: irreversible inactivation of porcine pancreatic elastase and human leukocyte elastase
作者:William C. Groutas、William R. Abrams、Michael C. Theodorakis、Annette M. Kasper、Steven A. Rude、Robert C. Badger、Timothy D. Ocain、Kevin E. Miller、Min K. Moi
DOI:10.1021/jm00380a010
日期:1985.2
were found to inhibitirreversibly both enzymes. Compound 10 was found to be a specific and selective inhibitor of human leukocyte elastase. In contrast to these, inhibitorsderivedfrom glycine methyl ester 1, D-valine methyl ester 4, and D-norvaline methyl ester 6 were found to be inactive. The results of the present study show that latent isocyanates derivedfrom appropriate aminoacids can serve as
Amine Activation: “Inverse” Dipeptide Synthesis and Amide Function Formation through Activated Amino Compounds
作者:Eleonora Tosi、Jean-Marc Campagne、Renata Marcia de Figueiredo
DOI:10.1021/acs.joc.2c01288
日期:2022.9.16
A copper(II)/HOBt-catalyzed procedure for the synthesis of dipeptides and “general” amides has been developed using microwave irradiation to considerably hasten the reaction. As an alternative to using traditional carboxylic acid activation, the method relies on the use of N-acyl imidazoles as activated amino partners. By doing so, a nonconventional way to reach dipeptides and amides has been proposed
已开发出一种铜 (II)/HOBt 催化合成二肽和“一般”酰胺的方法,使用微波辐射可显着加速反应。作为使用传统羧酸活化的替代方法,该方法依赖于使用 N-酰基咪唑作为活化的氨基伙伴。通过这样做,通过具有挑战性且研究较少的 N → C 方向合成,提出了一种非常规的方法来获得二肽和酰胺。已成功合成了一系列二肽和“通用”酰胺,并且该方法的适用性已在克级合成中得到说明。所提出的温和反应条件完全适合在敏感氨基酸存在下进行偶联,从而提供没有可检测到的外消旋作用的产物。此外,