Transfer reactions involving boron. XXII. Position-specific preparation of dialkylated ketones from diazo ketones and methyl vinyl ketone via vinyloxyboranes
α-alkylation and α-alkylidenation of carbonyl compounds by o-silylated enolate phenylthioalkylation
作者:Ian Paterson
DOI:10.1016/s0040-4020(01)86667-9
日期:1988.1
For many reactions next to a carbonyl group, the use of O-silylated enolatechemistry offers improvements in yield and selectivity over the corresponding reactions of Group I metal enolates. In the case of α-alkylation of carbonylcompounds, Lewis-acid (TiCL4 or ZnBr2) promoted phenylthioalkylation of O-silylated enolates 3 by α-chlorosulphides 4 (R3=H, Me, Prn, Pri, But, and Me3Si), followed by reductive
Lithium naphthalenide induced reductive alkylation of α-cyano ketones. A general method for regiocontrol of α, α-dialkylation of ketones
作者:Hsing-Jang Liu、Jia-Liang Zhu、Kak-Shan Shia
DOI:10.1016/s0040-4039(98)00780-1
日期:1998.6
An efficient generalmethod for the consecutive introduction of two alkyl groups to the α carbon of a ketone carbonyl has been developed, making use of the lithium naphthalenide induced reductive alkylation of an α-cyano ketone system as a key operation.