Novel types of compounds, N-tributylstannyl-2-oxazolidinone (4a) and tetrahydro-2H-1,3-oxazin-2-one (4b), are formed from the adduct of (n-Bu3Sn)2O (1) with ω-haloalkyl isocyanate (2), and the subsequent coupling reaction with alkyl halides gives a variety of N-substituted 2-oxazolidinones and tetrahydro-2-oxazinones in a one-pot procedure. Both the cyclization and the coupling reaction proceed quantitatively in the presence of HMPA which enhances the reactivity of the Sn–heteroatom bond by coordination.
新型化合物N-三正
丁基锡-
2-噁唑烷酮 (4a) 和四氢-2H-1,3-
噁唑啉-2-酮 (4b) 是由(n-Bu3Sn)2O (1) 与ω-卤烷基
异氰酸酯 (2)的加合物形成的。随后与烷基卤化物的偶联反应在一锅中生成多种N-取代的
2-噁唑烷酮和四氢-2-
噁唑啉酮。在HMPA的存在下,环化和偶联反应都以定量方式进行,HMPA通过配位增强了Sn–杂原子键的反应性。