Thieme Chemistry Journals Awardees – Where Are They Now? A Cascade Synthesis of 1,2,4-Triazin-3(2H)-ones Using Nitrogen-Substituted Isocyanates
作者:André Beauchemin、Mohammed Dahab、Joshua Derasp
DOI:10.1055/s-0036-1588099
日期:——
A cascade synthesis of 1,2,4-triazin-3(2H)-ones is reported from readily accessible α-amino ketones and phenyl carbazate as a masked N-isocyanate precursor. The mild protocol provides a simple route to products with substitution patterns which are difficult to form directly. This also presents the first N-isocyanate cascade requiring the use of acidic conditions, which accelerates formation of the
据报道,1,2,4-triazin-3(2H)-ones 的级联合成来自容易获得的 α-氨基酮和苯甲酸苯酯作为掩蔽的 N-异氰酸酯前体。温和的协议为具有难以直接形成的替代模式的产品提供了一种简单的途径。这也呈现出需要使用酸性条件的第一个 N-异氰酸酯级联,这会加速腙中间体的形成和环化步骤。这种级联进一步强调了在形成高反应性 N-异氰酸酯中间体的反应中可以实现高度控制。