According to our proposed SMH mechanism, there are rooms to expand scopes of alkynes. For example, if we change siloxy-alkyne into N-silyl protected ynamide (or ynamine) B-1, this reaction may also take place (Scheme 4a). We use carbamate 2a and N-TMS substituted ynamide B-TMS-1 as model to clarify this point of view (see details in SI, Figure ), our calculations shows that the hydroamidation of B-TMS-1 through SMH pathway is quite easy with a rate determine barrier (RDB) only 18.0 kcal/mol. In our proposed SMH pathway, hydrogen atom of amide 2 was activated into silylium ion through p-π conjugate effect, which implies that some cyclic-p-π conjugation system, such as diazoles, triazoles, 1H-1,2-diazepine, 1H-1,3-diazepine and so on, may also be suitable substrates for this reaction (see Scheme 4b and Scheme 4c). For example, hydroamination of siloxy-alkyne 1a with 1,2-diazole is quite easy with a rate-determine barrier 18.0 kcal/mol (see details in SI, Figure ). As for 1,3-diazoles, the silylium ion migration of last step take place through SN2 pathway, with a rate determine barrier 18.0 kcal/mol (see details in SI, Figure ). The NUA process can be eliminated by reduce the volume of SiR3 group (Scheme 4c).