Simple Preparation of Diamondoid 1,3-Dienes via Oxetane Ring Opening
摘要:
The transformations of apical mono- and bisacetyl diamondoids to the respective oxetanes and subsequent acid-catalyzed ring opening/dehydration lead to diamondoidyl mono- and bis-1,3-dienes in high preparative yields.
Stereospecific Consecutive Epoxide Ring Expansion with Dimethylsulfoxonium Methylide
作者:Ekaterina D. Butova、Anastasiya V. Barabash、Anna A. Petrova、Christian M. Kleiner、Peter R. Schreiner、Andrey A. Fokin
DOI:10.1021/jo101330p
日期:2010.9.17
Consecutive ring-expansion reactions of oxiranes with dimethylsulfxonium methylide were studied experimentally and modeled computationally at the density functional theory (DFT) and second-order Møller−Plesset (MP2) levels of theory utilizing a polarizable continuum model (PCM) to account for solvent effects. While the epoxide to oxetane ring expansion requires 13−17 kcal mol−1 activation and occurs
[EN] MONOBACTAMS AND METHODS OF THEIR SYNTHESIS AND USE<br/>[FR] MONOBACTAMES ET PROCÉDÉS DE SYNTHÈSE ET D'UTILISATION DE CES DERNIERS
申请人:HARVARD COLLEGE
公开号:WO2015103583A1
公开(公告)日:2015-07-09
Described herein are monobactam antibiotics of Formula (I), (Ι'), (II), and (II'), along with methods and intermediates for preparing these compounds. Pharmaceutical compositions and methods of treating infectious diseases using the monobactams are also provided.
Beyond the Corey Reaction: One-Step Diolefination of Cyclic Ketones
作者:Ekaterina D. Butova、Andrey A. Fokin、Peter R. Schreiner
DOI:10.1021/jo070653z
日期:2007.7.1
reaction the Yurchenko diolefination). Our mechanistic proposal involves the deprotonation of the betaine that forms after the attack of dimethylsulfoxonium methylide on the carbonyl group of the ketone. The key step of the diolefination reaction involves a [2,3]-sigmatropic rearrangement of the ylide to a γ-unsaturated sulfoxide with a barrier of 9.9 kcal/mol (ΔH298, MP2/cc-pVDZ, for the cycloheptane
Synthesis of 2,2-disubstituted oxetanes from ketones with S-methyl-S-(sodiomethyl)-N-(4-tolylsulfonyl)sulfoximine
作者:Steven C. Welch、A. S. C. Prakasa Rao、John T. Lyon、Jean Marie Assercq
DOI:10.1021/ja00340a019
日期:1983.1
MONOBACTAMS AND METHODS OF THEIR SYNTHESIS AND USE
申请人:PRESIDENT AND FELLOWS OF HARVARD COLLEGE
公开号:US20160326157A1
公开(公告)日:2016-11-10
Described herein are monobactam antibiotics of Formula (I), (I′), (II), and (II′), along with methods and intermediates for preparing these compounds. Pharmaceutical compositions and methods of treating infectious diseases using the monobactams are also provided.