Synthesis and Crystal Structure of 3,3,6,6-Tetramethylmorpholine-2,5-dione, and Its 5-Monothioxo and 2,5-Dithioxo Derivatives
作者:Nasser Mawad、Fatemeh Ghorbani-Salman Pour、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.201000318
日期:2010.12
and morpholine‐2,5‐dithiones 11, respectively, depending on the reaction conditions. The structures of 3aa, 4aa, 10a, and 11a were established by X‐ray crystallography. All attempts to prepare S‐containing morpholine‐2,5‐dione analogs or thiomorpholine‐2,5‐diones by cyclization of corresponding S‐containing precursors were unsuccessful and led to various other products. The structures of some of them
3,3-二甲基吗啉-2,5-二酮4a的合成可通过3型线性前体的``直接酰胺环化''轻松实现,该线性前体是通过偶联2,2-二甲基-2 H-叠氮基- 3-胺2与2-羟基链烷酸1。根据反应条件,用Lawesson试剂对4a进行亚硫酰化反应,分别得到相应的5-thioxomorpholin-2-ones 10和吗啉-2,5-dithiones 11。的结构3AA,4AA,10A和11A由X射线晶体学确定。通过相应的含S前体的环化制备含S的吗啉-2,5-二酮类似物或thiomorpholine-2,5-二酮的所有尝试均未成功,并导致了其他各种产品。其中一些的结构也已通过X射线晶体学确定。