Me2HSiCH2CH2CH2Cl reacts with primary alkyl, aryl or aralkyl amines to form the corresponding 1-aza-2-silacyclopentanes Me2R. It seems that the ease of ring closure is a result of enhanced reactivity of the SiH bond of the intermediate [Me2HSiCH2CH2CH2NHR] arising from intramolecular Si ⋯ N interaction.