A Clean, Simple, and Efficient Synthesis of 2-Substituted Aryl (Indolyl) Kojic Acid Derivatives by Kaolin/Ag Nanocomposite as a Reusable Catalyst: A Green Protocol

Table 3

Optimization amount of Kaolin/Ag nanocomposite catalyst for the synthesis of 4a.

Entry	Catalyst	Yield^a (%)
1	—	—
2	0.0005	57
3	0.0008	83
4	0.001	98

aReaction conditions: 60 min at 90°C in solvent-free conditions.