Fig. 3: Substrate scope expansion by varying substitution (R3 and R4) at cyclobutyls (a, b, e). | Nature Communications

Fig. 3: Substrate scope expansion by varying substitution (R3 and R4) at cyclobutyls (a, b, e).

From: An efficient approach to angular tricyclic molecular architecture via Nazarov-like cyclization and double ring-expansion cascade

Fig. 3

(a) Reactions were carried out at rt with 0.1 mmol of 4 in 1.0 mL CHCl3 for 12 h. (b) Isolated yields. (c) Reaction at −10 °C with DCM/HFIP (1:1) as solvent, with 0.6 equiv NaBArF as additive. (d) Reaction at 50 °C. e Unless noted, dr > 20:1. f Determined by XRD.

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