作者:Christine Zioudrou、Irene Moustakali-Mavridis、Polyxene Chrysochou、Gerasimos J. Karabatsos
DOI:10.1016/0040-4020(78)87014-8
日期:1978.1
The diastereomeric product ratios from reactions involving the addition of various reagents to the carbonyl of φCH3HC-COR compounds varies over a wide range. This variation is interpreted as due partly to changes in the structure of the diastereomeric transition states with changes in the size of R. For example, when R is smaller than the φCH3HC group the diastereomeric product ratios are close to
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).
Direct transformation of allylic and benzylic alcohols or their silylated derivatives into organolithium compounds
作者:Emma Alonso、David Guijarro、Miguel Yus
DOI:10.1016/0040-4020(95)00709-h
日期:1995.10
The reaction of allylic or benzylic alcohols 1 with n-butyllithium followed by treatment with lithium powder and a catalytic amount of DTBB (5 mol %) in THF at room temperature gives a solution of the corresponding alkyllithium reagent, which reacts in situ with different electrophiles to yield the expected products 2. Alternatively, the O-silylated derivatives of the same alcohols are lithiated under Barbier-type reaction conditions to afford the same reaction products with better yields.
A novel, catalytic enantioselective route to synthesize a variety of a-tertiary aryl ketones via a boron Lewis acid promoted formal insertion of aryldiazoalkane into the C-H bond of both aromatic and aliphatic aldehydes is described. In the presence of chiral (S)-oxazaborolidinium ion catalyst 1, the reaction proceeded in good yields (up to 94%) with excellent enantioselectivities (up to 99% ee).