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Scope of [3+1] ring expansion.
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Standard conditions: Slow addition of the diazoester (1.3 equiv) to aziridine (1.0 equiv) over 2 h. Numbers refer to isolated yields.
2.0 equiv of the diazoesters were used.
4 equiv of the diazoesters were used.
4.0 equiv of the iodonium ylide were added as two portions over 15 min.
2.5 equiv of the diazoester were used at 40 °C.
