Yang L, Wang H, Lang M, Wang J, Peng S. B(C
6F
5)
3-Catalyzed Formal (
n + 3) (
n = 5 and 6) Cycloaddition of Bicyclo[1.1.0]butanes to Medium Bicyclo[
n.1.1]alkanes.
Org Lett 2024;
26:4104-4110. [PMID:
38700913 DOI:
10.1021/acs.orglett.4c01219]
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Abstract
Herein, a B(C6F5)3-catalyzed formal (n + 3) (n = 5 and 6) cycloaddition of bicyclo[1.1.0]butanes (BCBs) with imidazolidines/hexahydropyrimidines is described. The reaction provides a modular, atom-economical, and efficient strategy to two libraries of synthetically challenging medium-bridged rings, 2,5-diazabicyclo[5.1.1]nonanes and 2,6-diazabicyclo[6.1.1]decanes, in moderate to excellent yields. This reaction also features simple operation, mild reaction conditions, and broad substrate scope. A scale-up experiment and various synthetic transformations of products further highlight the synthetic utility.
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