A straightforward microwave method for rapid synthesis of N-1, C-6 functionalized 3,5-dichloro-2(1H)-pyrazinones
作者:Johan Gising、Pernilla Örtqvist、Anja Sandström、Mats Larhed
DOI:10.1039/b905501k
日期:——
A rapid and versatile one-pot, 2 × 10 min microwave protocol for the preparation of N-1 and C-6 decorated 3,5-dichloro-2(1H)-pyrazinones was developed. Comparable reaction sequences using classical conditions require about 1–2 days of heating. The α-aminonitrile was first generated in a Strecker reaction and thereafter cyclized under microwave heating. The microwave approach developed offers the possibility of efficiently generating and utilizing functionalized 3-amino-5-chloro-2(1H)-pyrazinone-N-1-carboxylic acids as β-strand inducing core structures in a medicinal chemistry context. To illustrate the usefulness of the method, the synthesis of two novel 2(1H)-pyrazinone-containing Hepatitis C virus NS3 protease inhibitors is reported.
开发了一种快速且多功能的单锅法2×10分钟微波协议,用于制备N-1和C-6修饰的3,5-二氯-2(1H)-吡嗪酮。使用经典条件进行的可比反应序列需要大约1-2天的加热时间。首先通过斯特雷克反应生成α-氨基腈,然后在微波加热下环化。所开发的微波方法提供了高效生成和利用功能化的3-氨基-5-氯-2(1H)-吡嗪酮-N-1-羧酸作为药物化学背景下β-链诱导核心结构的可能性。为了说明该方法的实用性,报道了两个新型含有2(1H)-吡嗪酮的丙型肝炎病毒NS3蛋白酶抑制剂的合成。