The unambiguous synthesis and NMR assignment of 4-alkoxy and 3-alkylquinazolines
作者:Marcel Špulák、Zdeněk Novák、Karel Palát、Jiří Kuneš、Jana Pourová、Milan Pour
DOI:10.1016/j.tet.2012.12.031
日期:2013.2
whose reaction with an amine yielded the corresponding N3-alkyl derivative. A mechanism corroborated by 15N-labeling involving pyrimidine ring opening and recyclisation is proposed. Finally, the unambiguous preparation of 4-alkoxyquinazolines is described via treatment of 3,4-dihydroquinazoline-4-ones with PCl5 followed by an alkoxide.
与许多报道相反,特权的3,4-二氢喹唑啉骨架的烷基化提供了N 3-烷基化的产物,而不是4-烷氧基喹唑啉。为了正确分配结构,–Z–CH n –(Z = O,N)片段的13 C NMR位移是必要的;在45-55 ppm范围内的共振表明N3-烷基化。用对-TsCl处理3,4-二氢喹唑啉-4-酮,得到N 3-甲苯磺酸化的化合物,其与胺的反应产生相应的N 3-烷基衍生物。由15 N证实的机制提出了涉及嘧啶开环和环化的β-标记。最后,描述了通过用PCl 5然后用醇盐处理3,4-二氢喹唑啉-4-酮来明确制备4-烷氧基喹唑啉的方法。
Metal-free oxidative synthesis of quinazolinones via dual amination of sp<sup>3</sup> C–H bonds
作者:Dan Zhao、Teng Wang、Jian-Xin Li
DOI:10.1039/c4cc02648a
日期:——
A novel metal-free synthesis of quinazolinones via dual amination of sp3 C–H bonds was developed. The sp3 carbon in methylarenes or adjacent to a heteroatom in DMSO, DMF or DMA was used as the one carbon synthon.
Bi(TFA)3–[nbp]FeCl4: a new, efficient and reusable promoter system for the synthesis of 4(3H)-quinazolinone derivatives
作者:Ahmad R. Khosropour、Iraj Mohammadpoor-Baltork、Hamid Ghorbankhani
DOI:10.1016/j.tetlet.2006.03.079
日期:2006.5
4(3H)-Quinazolinones have been synthesized in high to excellent yields through the one-pot condensation of anthranilic acid, trimethyl orthoformate and primary amines in the presence of 5 mol % of Bi(TFA)(3) immobilized on [nbp]FeCl4 as a room temperature ionic liquid. (c) 2006 Published by Elsevier Ltd.