at the β-position by an ester group is reported using either CuI or Pd2(dba)3. In the case of using CuI (10 mol %) as catalyst and Cs2CO3 as base in dioxane, 2-(methoxycarbonyl)-α-tetralones are smoothly converted into the corresponding methyl 1-hydroxy-2-naphthoates at 70 °C under air. Alternatively, Pd2(dba)3 (1.25 mol %) can also be used as catalyst in the presence of K3PO4 as base in toluene also
使用CuI或Pd 2(dba)3报道了在β位被酯基取代的α-四氢
萘酮的芳构化。在
二恶烷中使用CuI(10 mol%)作为催化剂和Cs 2 CO 3作为碱的情况下,在70°C下将2-(甲氧基羰基)-α-四氢
萘酮平稳地转化为相应的
1-羟基-2-萘甲酸甲酯在空气中。或者,在K 3 PO 4的存在下,也可以将Pd 2(dba)3(1.25 mol%)用作催化剂。也是在70°C
氩气下在
甲苯中作为碱。这些是将这些类型的α-四氢
萘酮进行芳构化的最直接方法。由于更高的效率,经济和实用的原因,CuI是选择的催化剂。