Formation of<i>N</i>-Tributylstannyl Heterocycle from Bis(tributyltin) Oxide and ω-Haloalkyl Isocyanate. One-Pot Convenient Synthesis of 2-Oxazolidinones and Tetrahydro-2<i>H</i>-1,3-oxazin-2-one
作者:Ikuya Shibata、Kenji Nakamura、Akio Baba、Haruo Matsuda
DOI:10.1246/bcsj.62.853
日期:1989.3
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。