Selective and High-Yield Electrosynthesis of (Silyl and Silanylene 1-Methylpyrroles) from 1-Methylpyrrole Bromides
摘要:
The sacrificial anode technique proved to be efficient for the selective and competitive silylation of 1-methylpyrrole bromides with trimethylchlorosilane and diorganodichlorosilanes. Linear and cyclic alternated 1-methyl-pyrrolylene-silanylene oligomers were obtained in good to high yields.
New group 14 5-metallated pyrrole-2-carbaldehydes 5-R3E(C4H2NR′)CHO (E Si, Ge, Sn; R Me, Et, nBu; R′ H, Me) have been regiospecifically prepared from corresponding pyrrole-2-carbaldehydes by either (i) 5-lithiation after protection of the aldehyde function by treatment with lithium N-methylpiperazide or by formation of an azafulvene dimer or (ii) metallation by R3EX (X Cl, Br). The 5-silylated