Citation:
Liu Xunshen, Li Meimei, You Jun, Liu Bo. Asymmetric 1, 3-Dipolar Cycloaddition Reaction of C, N-Diarylnitrone with N-α, β-Unsaturated Acylpyrazoles Catalyzed by Ni-DBFOX/Ph[J]. Chinese Journal of Organic Chemistry,
;2017, 37(1): 86-91.
doi:
10.6023/cjoc201608019
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Using (R, R)-4, 6-dibenzofurandiyl-2, 2'-bis (4-phenyloxazoline)-Ni (Ni-DBFOX) as the catalyst, asymmetric catalytic 3-dipolar cycloaddition reactions between N-α, β-unsaturated acylpyrazoles and C, N-diarylnitrone have been developed with 95% regioselectivity and an endo/exo ratio of 99:1 with >90% ee of the endo-diastereomer.Influence of olefins, nitrone structure, metal type and amount of catalyst on the reaction stereoselectivity was also carefully discussed.
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