Lingying Leng

General Procedure A for the Synthesis of Compounds 9–23 General Step a and b To a solution of intermediate 33 (2.0 mmol, 1.0 equiv) in a DMF/DCE (1:1, 20 mL) mixture, aldehyde reagent 34 (3.0 mmol, 1.5 equiv) or acetone reagent 35 (4.0 mmol, 2.0 equiv) was added, followed by AcOH (0.2 mmol, 0.1 equiv) as a catalyst. The reaction mixture was stirred at room temperature overnight. Subsequently, NaBH(OAc)3 (4.0 mmol, 2.0 equiv) was added, and stirring continued for an additional 3 h.