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[26] The relative stereochemistry of 4aa is same as the result of Rh(Ⅲ) catalyzed reaction. The minor product 4aa' has also been isolated (from the 5 mmol scale reaction) and characterized by using 1H NMR & 13C NMR spectroscopy and HRMS.
[27] It was notable 4ba-4ha's diasteroselectivities are higher than the results of Rh(Ⅲ) catalyzed reaction reported in previous research.
[28] Compound 4ae' is inseparable from the N-H insertion product.
[29] Another type of possible amine-exchange side product, with phenylamine acting as the nucleophile, and N-(4-fluorophenyl)-1-(4-nitrophenyl)methanimine (the amine-exchange imine substrate) as the electrophile, was not observed in Eq (3)'s reaction. Eq (4)'s result is similar to Eq (3). |