A highly efficient Gilman-Speeter synthesis of 3,4-trisubstituted β-lactams possessing a 4-aryl substituent is described, employing a direct, uncatalyzed Mannich reaction between TMS imines and TMS ketene acetals. The process avoids cryogenic conditions, making it more amenable to process-scale use than related methods for β-lactam synthesis. A Gilman-Speeter diastereoselective version using a sulfinyl imine and leading to homochiral sulfinyl β-aminoester is also presented.

中文翻译：

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通过Thorpe-Ingold效应直接实用的Gilman-Speeter合成3,4-三取代的β-内酰胺

描述了具有TMS亚胺和TMS烯酮缩醛之间直接，未催化的曼尼希反应的高效的Gilman-Speeter合成具有4-芳基取代基的3,4-三取代的β-内酰胺的方法。该方法避免了低温条件，使其比β-内酰胺合成的相关方法更适合于工艺规模使用。还提出了使用亚磺酰基亚胺并导致同手性亚磺酰基β-氨基酯的Gilman-Speeter非对映选择性方案。