Improved Julia−Kocienski Conditions for the Methylenation of Aldehydes and Ketones
摘要:
The scope of the methylenation of aldehydes and ketones under optimized Julia-Kocienski conditions is broadened by using 1-tert-butyl-1H-tetrazol-5-ylmethyl sulfone. Two different Barbier-type procedures are applied with NaHMDS at -78 degrees C or Cs2CO3 at 70 degrees C. The latter conditions are also adapted for the preparation of 1,2-disubstituted olefins and intramolecular olefination reactions.
Unnatural α-amino ethyl esters from diethyl malonate or ethyl β-bromo-α-hydroxyiminocarboxylate
作者:Eloi P Coutant、Vincent Hervin、Glwadys Gagnot、Candice Ford、Racha Baatallah、Yves L Janin
DOI:10.3762/bjoc.14.264
日期:——
We have explored here the scope of the age-old diethyl malonate-based accesses to α-aminoesters involving Knoevenagel condensations of diethyl malonate on aldehydes, reductions of the resulting alkylidenemalonates, the preparation of the corresponding α-hydroxyimino esters and their final reduction. This synthetic pathway turned out to be general although some unexpected limitations were encountered
[EN] IMIDAZOPYRAZINE DERIVATIVES, PROCESS FOR PREPARATION THEREOF, AND THEIR USES AS LUCIFERINS<br/>[FR] DÉRIVÉS D'IMIDAZOPYRAZINE, LEUR PROCÉDÉ DE PRÉPARATION ET LEURS UTILISATIONS EN TANT QUE LUCIFÉRINES
申请人:PASTEUR INSTITUT
公开号:WO2018197727A1
公开(公告)日:2018-11-01
The present invention is in the field of bioluminescence in biology and/or medicine. In particular, the invention provides imidazopyrazine derivatives, processes for preparation thereof, and their uses as luciferins.
Synthetic studies toward longeracemine: The intramolecular [4+2] cycloaddition of 3H-pyrroles
作者:Joshua B. Cox、John L. Wood
DOI:10.1016/j.tet.2018.07.024
日期:2018.8
Model studies to develop a tetracyclization approach mimicking the proposed biosynthesis of the secodaphnane-type alkaloid longeracemine are described. These studies have culminated in the successful implementation of a 3H-pyrrole [4+2] cycloaddition that delivers a longeracemine-like azabicycle containing three contiguous quaternary stereocenters.
IMIDAZOPYRAZINE DERIVATIVES, PROCESS FOR PREPARATION THEREOF, AND THEIR USES AS LUCIFERINS
申请人:Institut Pasteur
公开号:EP3395803A1
公开(公告)日:2018-10-31
The present invention is in the field of bioluminescence in biology and/or medicine. In particular, the invention provides imidazopyrazine derivatives, processes for preparation thereof, and their uses as luciferins.