Trimethylsilylcarbene and bis(trimethylsilyl) formaldehyde azine complexes of chiral bis(4-isopropyloxazolinyl)pyridine(dichloro)ruthenium(II)

Abstract

A mixture of [{Ru^IICl₂(p-cymene)}₂]1 and 2,6-bis(4-isopropyloxazolinyl)pyridine (pyboxip)2 was treated with trimethylsilyldiazomethane to give the trimethylsilylcarbene complex trans-[Ru^IICl₂(pyboxip)(CHSiMe₃)]3 at 0–15 °C in 94% yield and the azine complex trans-[Ru^IICl₂(pyboxip)(Me₃SiCHN–NCHSiMe₃)] at 25–35 °C in 73% yield; the catalytic activity of 3 was examined for dimerization and asymmetric cyclopropanation with ethyl diazoacetate.