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. 2022 Jun 23;7(26):22839–22849. doi: 10.1021/acsomega.2c02449

Table 1. Amounts of the Cys Catalyst Used in Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones/thiones (4–9).

entry cat. mol % yield %a entry cat. mol % yield %a
1 3 21 5 13 84
2 6 41 6 15 98
3 9 58 7 16 98
4 11 76 8 17 98
a

Isolated yields based on 4, 1(1 mmol), 2a (1.5 mmol), and 3a (1 mmol) in a mixture of water and ethanol (3:1 ratio) by microwave irradiation condition, 3 min.