Heterocyclic substituted silatranes. Part I. Synthesis and characterization of pyrazolyl substituted aminoalkylsilatranes

N-[Bis(3,5-dimethylpyrazol-1-yimethyl)aminopropyl] - (6a) and N-[bis(3,5-dimethylpyrazol-1-ylmethyl)aminopropyl]-3,7,10-trimethylsilatranes(6b) have been obtained in high yields from the reaction of N-[bis(3,5-dimethylpyrazol-1-ylmethyl)aminopropyl]triethoxysilane (3a) with triethanolamine (4a) or triisopropanolamine (4b). The corresponding N-phenyl derivative (6c) was also obtained by the reaction of N-phenyl-[(3,5-dimethylpyrazol-1-ylmethyl)aminopropyl]trimethoxysilane (3b) with (4a). N-[3,5-Dimethylpyrazol-1-ylmethyl-3 -silatranylaminopropyl]-N'-[bis(3,5-dimethylpyrazol-1-ylmethyl)ethylenediamine (10a) and N-[3,5-dimethylpyrazol-1-ylmethyl]-3'-[(3,7,10-trimethylsilatranyl)aminopropyl]- N'-[bis(3,5-dimethylpyrazol-1-ylmethyl)]ethylenediamine (10b) have also been synthesized by the reaction of N-[3,5-dimethylpyrazol-1-ylmethyl]-N'-[bis(3,5-dimethylpyrazol-1-ylmethyl)ethylenediamine]trimethoxysilane (8) with (4a) and (4b). The precursor alkoxy compounds (3a), (3b) and (8) themselves were synthesized by reaction of 1-hydroxymethyl-3,5-dimethylpyrazole (2) with 3-aminopropyltriethoxy- (1a), N-phenylaminopropyltrimethoxy-(1b) and N-[2-aminoethyl(aminopropyl)]trimethoxysilanes (7), respectively.