A novel approach to functionalised 5,7,8,9-tetrahydropyrimido[4,5-b][1,4]diazepin-6-ones using intramolecular palladium-catalysed amidation
摘要:
The development of a novel palladium-catalysed amidation approach towards 5,7,8,9-tetrahydropyrimido[4,5-b][1,4]diazepin-6-one templates is highlighted. The route proceeds through the reaction of an amino amide, generated by 1,4-addition of an amine to an acrylamide, with 5-bromo-2,4-dichloropyrimidine and final palladium-catalysed cyclisation to provide the functionalised scaffold in up to 60% isolated yield over three steps. The route offers efficiency advantages over the previously reported nitro-reduction cyclisation approach to these molecules. It also provides alternative means to introduce bulky alkyl substituents at the amide nitrogen. The application of this route in the synthesis of a variety of analogues is described. (C) 2012 Published by Elsevier Ltd.
DOI:
10.1016/j.tetlet.2012.03.125
作为产物:
描述:
N-乙基丙烯酰胺 、 环戊胺 在
甲醇 、 desired product 、 氨 作用下,
以
甲醇 为溶剂,
反应 0.5h,
以afforded the title compound as a brown oil (1.48 g, 80%)的产率得到3-(cyclopentylamino)-N-ethyl-propanamide
[EN] There is provided a compound of formula (I):processes for the manufacure thereof, pharmaceutical compoitions thereof and uses in therapy. [FR] L'invention concerne un composé représenté par la formule (I), des procédés de fabrication de ce composé, des compositions pharmaceutiques de ce composé et les utilisations thérapeutiques de ce composé.