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We only observed the product alkylated at the C-4 position and we did not observe in the crude 1 H NMR any other alkylated product
Cyclic ketimines such as 4-methylbenzo[ e ][1,2,3]oxathiazine 2,2-dioxide or 3-methylbenzo[ d ]isothiazole 1,1-dioxide were not reactive under the optimized reaction conditions
CCDC 1875758 ( 3e ) and CCDC 1846586 ( 7a ) contains the supplementary crystallographic data for this paper
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