Intramolecular Rearrangement of α-Azidoperoxides: An Efficient Synthesis of tert-Butyl Esters
摘要:
An unprecedented intramolecular rearrangement of alpha-azidoperoxides, promoted by simple organic base to provide tert-butyl esters, has been presented. Further, a one-pot methodology consisting of in situ generation of the a-azidoperoxides from corresponding aldehydes followed by base-promoted rearrangement to obtain the desired ester has also been executed. Relevant mechanistic studies, to provide the proof for intramolecular alkoxy transfer, are investigated.
作者:Douglass F. Taber、David A. Gerstenhaber、Xia Zhao
DOI:10.1016/j.tetlet.2006.03.005
日期:2006.5
A general method is presented for the preparation of tert-butyl esters by the gentle warming of the carboxylic acid in the presence of excess of tert-butyl acetoacetate and a catalytic amount of acid. This method generates only low pressures, and is therefore suitable for laboratory scale pressure glassware.
“New” Catalysts for the Ester-Interchange Reaction: The Role of Alkali-Metal Alkoxide Clusters in Achieving Unprecedented Reaction Rates
作者:Matthew G. Stanton、Cara B. Allen、Rebecca M. Kissling、Alice L. Lincoln、Michel R. Gagné
DOI:10.1021/ja980584t
日期:1998.6.1
clusters on the rate of ester interchange for several pairs of esters has been determined in nonpolar and weakly polar solvents. Reactivities increase in the order (Li+ < Na+ < K+ < Rb+ < Cs+) with the fastest rates reaching 107 catalytic turnovers per hour (TO/h). Ester interchange rates were sensitive to the size of both the transferring OR groups and the ester substituent. Phenyl esters did not exchange
Disclosed herein are compounds of Formula (I) that include a sulfonate ester, ester or ether group. Compounds of Formula (I) can be included in pharmaceutical compositions, and can be used to treating and/or ameliorating a disease or condition, such as cancer, a microbial disease and/or inflammation.
Transition-Metal-Free Alkoxycarbonylation of Aryl Halides
作者:Hua Zhang、Renyi Shi、Anxing Ding、Lijun Lu、Borui Chen、Aiwen Lei
DOI:10.1002/anie.201206518
日期:2012.12.7
Transitions: The title reaction has been developed for the synthesis of a variety of tert‐butyl benzoates by employing 1,10‐phenanthroline as an additive. Various functional groups were tolerated and heteroaryl iodides were also suitable substrates. Preliminary mechanism studies were conducted and indicate the participation of radical intermediates.
[EN] PROCESS FOR THE MANUFACTURE OF DIBENZOYLMETHANE DERIVATIVES<br/>[FR] PROCÉDÉ DE PRODUCTION DE DÉRIVÉS DE DIBENZOYLMÉTHANE
申请人:DSM IP ASSETS BV
公开号:WO2012084770A1
公开(公告)日:2012-06-28
The invention relates to a process for the manufacture of substituted dibenzoylmethane derivatives. This economical process provides products in high purity and yields and results in shorter reaction times.