A silver lining: [2+2] Cycloadditions of imines 2 to (alkoxymethylene)cyclopropanes 1 proceed readily at 80 °C and ambient pressure to furnish spirocyclopropanated 2-alkoxyazetidines 3 in good to excellent yields. The same reaction can be brought about at 30 °C in the presence of a catalytic amount of [Ag(fod)] (fod=6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedionato).
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Nakamura et al. (2006) studied this question.
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