diastereoselectivity. The processes are conducted under very simple experimental conditions, only in the presence of K2CO3, in 1,4-dioxane as solvent and under microwave irradiation, and have been applied for the synthesis of a wide structural variety of fused cyclopentanones and cyclohexanones. Moreover, the versatility of this methodology has been demonstrated in the structural modification of androsterone
通过烯基
硼酸与δ-或γ-
氰基-N-
甲苯磺酰腙的级联碳环化,定义了一种合成功能化碳环的新策略。在该反应中,两个 C(sp(3))-C(sp(2)) 键形成在前一个腙碳上,产生全碳季立体中心,并导致环状酮具有完全非对映选择性的烯基侧链。这些过程是在非常简单的实验条件下进行的,仅在 K2CO3 存在下,以 1,4-
二恶烷为溶剂并在微波辐射下进行,并已应用于合成各种结构的稠合
环戊酮和
环己酮。此外,这种方法的多功能性已在
雄酮的结构修饰中得到证明。