作者:Dieter Enders、Alexander Moll
DOI:10.1055/s-2005-865326
日期:——
The asymmetric synthesis of cis-3,4-disubstituted β-sultams is reported. The protocol is based on the oxidation of 1,2-aminothiols with H2O2 and ammonium heptamolybdate. The chlorination of the resulting β-amino sulfonic acids was achieved utilising a solution of phosgene in toluene. The β-aminosulfonyl chlorides obtained were cyclised to the title compounds under basic conditions without epimerisation (de, ee ≥96%) and good overall yields (17-59%). In addition, the N-Cbz-protection of β-sultams was easily accomplished.
报告了顺式-3,4-二取代δ-舒坦的不对称合成。该方法基于 1,2-氨基硫醇与 H2O2 和七钼酸铵的氧化反应。利用光气在甲苯中的溶液实现了对δ-氨基磺酸的氯化。得到的δ-氨基磺酰氯在碱性条件下环化成了标题化合物,没有发生环化反应(de,ee ≥96%),总产率高(17-59%)。此外,δ-苏丹的 N-Cbz 保护也很容易实现。