作者:Dieter Enders、Alexander Moll、Jan W. Bats
DOI:10.1002/ejoc.200500860
日期:2006.3
phosgene in toluene led to the aminosulfonyl chlorides, which were cyclised to the title compounds in good to excellent overall yields (39–51 %) and high enantiomeric excesses (ee = 78–99 %). The absolute configuration was determined by X-ray structure analysis and is in accordance with the postulated mechanism for the diastereoselective 1,2-addition. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany
描述了各种 3-取代 γ-和 δ-sultams 的有效和灵活的不对称合成。关键步骤是各种有机铈化合物与 ω-SAMP-腙磺酸盐的 CN 双键的非对映选择性亲核 1,2-加成。所得肼以良好至极好的非对映体过量(de = 78 至 ≥ 96 %)获得。通过还原性 N,N 键裂解去除手性助剂,得到相应的氨基磺酸盐而没有外消旋化。酯水解和随后在甲苯中用光气处理所得磺酸产生氨基磺酰氯,其环化为标题化合物,总产率良好至极好 (39–51 %) 和高对映体过量 (ee = 78–99 %) )。绝对构型是通过 X 射线结构分析确定的,并且符合非对映选择性 1,2-加成的假定机制。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)