One-pot synthesis of α-ketoacetals from aryl methyl ketones in the presence of selenous acid catalyzed by boron trifluoride etherate
作者:Icydora Kharkongor、Bekington Myrboh
DOI:10.1016/j.tetlet.2015.05.087
日期:2015.7
A simple and efficient one-pot preparation of α-ketoacetals from substituted acetophenones and triethylorthoformate in the presence of H2SeO3 and BF3·Et2O as catalyst has been developed. The desired products are obtained in good yields by a simple protocol involving neat and mild reaction conditions. The present methodology provides an attractive alternative method for the preparation of α-ketoacetal
开发了一种简单有效的一锅法,在H 2 SeO 3和BF 3 ·Et 2 O作为催化剂的情况下,由取代的苯乙酮和原甲酸三乙酯制备α-酮缩醛。通过涉及纯净的和温和的反应条件的简单方案以高收率获得所需产物。本方法提供了制备α-酮缩醛衍生物的有吸引力的替代方法。
Synergistic Catalysis of Se and Cu for the Activation of
<scp>
<i>α</i>
‐H
</scp>
of Methyl Ketones with Molecular Oxygen/Alcohol to Produce
<scp>
<i>α</i>
‐Keto
</scp>
Acetals
<sup>†</sup>
Selenium and copper synergistically catalyzed the oxidation/alkoxylation of methyl ketones to synthesize α‐keto acetals directly. Using O2 as oxidant and alcohol as solvent and alkoxylation reagent, the reaction is practical from industrial viewpoint. Mechanistic studies revealed that copper promoted the oxidation of organoselenium intermediates with O2 to allow the key rearrangement and selenoxide
efficient and straightforward method to synthesize enantio-enriched N-unprotected α-amino acetals via ruthenium-catalyzed direct asymmetric reductive amination. The α-amino acetal products are versatile and valuable platform molecules that can be converted to the corresponding α-amino acids, amino alcohols, and other derivatives by convenient transformations.
Titanocene, deren Verwendung und N-substituierte Fluoraniline
申请人:CIBA-GEIGY AG
公开号:EP0318893A2
公开(公告)日:1989-06-07
Titanocene mit zwei 5-gliedrigen Cyclodienylgruppen, z.B. Cyclopentadienyl, und ein oder zwei 6-gliedrigen carbocyclischen oder 5-oder 6-gliedrigen heterocyclischen aromatischen Ringen, die in mindestens einer der beiden Orthostellungen zur Titankohlenstoffbindung mit einem Fluoratom substituiert sind und als weiteren Substituenten einen substituierten Aminorest enthalten, eignen sich als Photoinitiatoren für die strahlungsinduzierte Polymerisation von ethylenisch ungesättigten Verbindungen.