Synthesis of 1,2,5-Thiadiazepine Derivatives by Ring Enlargement of 1,2-Thiazetidin-3-one 1,1-Dioxides with 3-Amino-2H-azirines
作者:Tonya R. Mihova、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.19960790803
日期:1996.12.11
At 0° in MeCN, 2,2-disubstituted 3-amino-2H-azirines 1 and 4,4-disubstituted 1,2-thiazetidin-3-one 1,1-dioxides 7 react smoothly to give 1,2,5-thiadiazepin-6-one 1,1-dioxides of type 8 (Scheme 2). The reaction mechanism of this regiospecific ring enlargement to seven-membered heterocycles follows previously described pathways. The structures of 7a and 8b were established by X-ray crystallography (see
在MeCN中,在0°时,2,2-二取代的3-amino-2 H-叠氮基1和4,4-二取代的1,2-噻唑丁-3-一1,1-二氧化物7平稳反应,得到1,2,5 -噻二氮杂卓-6-类型8的1,1-二氧化物(方案2)。该区域特异性环扩大为七元杂环的反应机理遵循先前描述的途径。通过X射线晶体学确定7a和8b的结构(参见图1和2)。