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. 2022 Nov 28;18:1607–1616. doi: 10.3762/bjoc.18.171

Scheme 6.

Scheme 6

Two-step (process A) vs cascade (process B) synthesis of 5a. i) 1.0:1.15 of 1a/2, EtOH (0.05 M), 25 °C, 6 h. ii) 1.1:1.0:1.0 of 1a/3a/4a, EtOH (0.5 M), 90 °C, 9 h (Table 1, entry 6). iii) 2.2:1.1:1.0 of 1a/2/4a, EtOH (0.5 M), 90 °C, 9 h (Table 1, entry 7).