Allylgermanes with a 4‐, 5‐, and 6‐coordinated germanium center were characterized by X‐ray crystallography. Cationic 6‐coordinated group 14 allylmetals, which were hitherto assumed to be a transition‐state structure of allylations, were successfully isolated. Forming high coordination states significantly enhanced the reactivity of the allylgermanes. In contrast to the 4‐coordinated allylgermanes
Regiocontrolled 1,2-, 1,4-, and 1,6-additions of organometallics to unsaturated thioamides
作者:Y. Tamaru、T. Harada、S. Nishi、Z. Yoshida
DOI:10.1016/s0040-4039(00)87348-7
日期:——
1,4-Addition of allyllithiums to α,β-unsaturated thioamides and 1,4-(kinetic) and 1,6-(thermodynamic)regiocontrolled additions of lithium enolates to thiosorbamide are reported.
Nucleophilic addition reactions of bridged triene η6-chromiumtricarbonyl complexes
作者:Rohan E. J. Beckwith、Alexander J. Blake、Nigel S. Simpkins、Claire Wilson、Michael B. Gravestock
DOI:10.1039/b002256j
日期:——
Bridged triene η6-chromiumtricarbonyl complexes have been shown to undergo regioselective additionreactions with a range of nucleophiles including organolithium reagents and enolates.
The DIBAL reduction of 2-phenylethyl 3,3,3-trifluoro-2-methylpropionate 2 at −78 °C afforded the aluminum acetal 3, and this intermediate, on worming up to 0 °C, was found to slowly decompose into the corresponding aldehyde 4, which smoothly reacted with appropriate nucleophiles in a one-pot manner in good to excellent yields with up to 93% diastereoselectivity.
Facile nucleophilic substitution of sulfonyl oxime ethers: an easy access to oxime ethers, carbonyl compounds and amines
作者:Sundae Kim、Nurul Ain Bte Kamaldin、Sol Kang、Sunggak Kim
DOI:10.1039/c0cc02081h
日期:——
Sulfonyl oxime ethers undergo facile nucleophilic substitutions with various nucleophiles to yield the corresponding oxime ethers which provide an easy access to amines and carbonylcompounds.