In the reactions we have studied in the Scheme 3, silylgroup of INT3B was activated into silylium ion through p-π conjugate effect. So, the substrates contain such p-π conjugation segment may be also suitable for this reaction (Scheme 3c). We choose silyl-1,2-diazole C-INT3b as model to verify this speculate (see details in Figure ). Our calculations shows that C-INT3b can react with ketene INT3A-1 to afford desired product with a rate determine barrier only 10.6 kcal/mol (see details in SI, Figure ).