Table 2.
Investigating Scope: varying pyrazole and diazo-ester partners.
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Reaction conditions: 1 (0.2 mmol), 2 (0.1 mmol), [Ir(coe)2Cl]2 (1 mol%), PTC-3 (1.4 mol%), CPA (1.4 mol%), 2-MeTHF (1.0 mL), 40 °C, 21 h. Yields of isolated products are given. Regioisomeric ratios (rr) were determined from 1H NMR analysis of the crude reaction mixtures. Enantiomeric ratios (er) were determined by HPLC analysis on a chiral stationary phase.
42 h.
The reaction was performed at 60 °C.
1.0 equiv. 1a was used.