Reductive opening of 2-phenyl-1,3-dioxolanes by a naphthalene-catalysed lithiation: synthetic applications
摘要:
The reaction of 2-phenyl-1,3-dioxolanes 1a,b with an excess of lithium powder in the presence of a catalytic amount of naphthalene (4 mol %) in tetrahydrofuran at -40-degrees-C followed by successive reaction with an electrophile and final hydrolysis with water at the same temperature yields the corresponding monoprotected 1,2-diols 2aa-2bf. The same process but allowing to rise the temperature to 20-degrees-C before the hydrolysis affords alcohols 3aa-3bd. The use of 2,2-diphenyl-1,3-dioxolane 1d, under similar reaction conditions as for compounds 2, permits the isolation of 2,2-diphenylalcohols 11da-11dc, resulting from the reaction with two different electrophiles. A mechanistic rationalization for all processes is given.
Reactivity of the secondary benzylic Grignard reagent from 1-phenylethyl chloride with aldehydes and ketones. More evidence for the rearrangement mechanism in benzyl Grignard reactions
作者:Claude Bernardon
DOI:10.1016/0022-328x(89)87200-6
日期:1989.5
the reaction of the Grignard reagent from benzyl chloride with aldehydes has been obtained from a study of the interaction of the Grignard reagent from 1-phenylethyl chloride with carbonyl compounds. This Grignard reagent reacts with ketones (except non-enolisable ketones) to give normal alcohols in low yields, and with aldehydes to give diols. However, in contrast to that formed in the reaction of
Disclosed are the ERK inhibitors of formula (1.0), having a pyrazolopyridine base structure, and the pharmaceutically acceptable salts thereof. Also disclosed are methods of treating cancer using the compounds of formula (1.0).