The invention concerns a process for preparing 2- and 4-alkoxycarbonylthiolan-3-ones useful as intermediates, which process involves cyclising a 3-akloxycarbonylmethylthiopropanoic acid ester using lithium alkoxide. Novel lithium salts are also included.
本发明涉及一种制备用作中间体的 2-和 4-烷氧基羰基硫杂环戊-3-酮的工艺,该工艺涉及使用烷氧化
锂对 3-烷氧基羰基甲基
硫代
丙酸酯进行环化。此外,还包括新型
锂盐。