A Novel Approach to the Practical Synthesis of Sulfides: An InBr<sub>3</sub>-Et<sub>3</sub>SiH Catalytic System Promoted the Direct Reductive Sulfidation of Acetals with Disulfides
Rearrangement of Hydroxylated Pinene Derivatives to Fenchone-Type Frameworks: Computational Evidence for Dynamically-Controlled Selectivity
作者:Marcus Blümel、Shota Nagasawa、Katherine Blackford、Stephanie R. Hare、Dean J. Tantillo、Richmond Sarpong
DOI:10.1021/jacs.8b05804
日期:2018.7.25
An acid-catalyzed Prins/semipinacolrearrangementcascade reaction of hydroxylated pinene derivatives that leads to tricyclic fenchone-type scaffolds in very high yields and diastereoselectivity has been developed. Quantum chemical analysis of the selectivity-determining step provides support for the existence of an extremely flat potential energy surface around the transition state structure. This
Anodic Cleavage of Several Ketone <i>N</i>-Phenylsemicarbazones into Methyl <i>N</i>-Phenylcarbamate and the Corresponding Dimethyl Acetals
作者:Shinnosuke Nishikawa、Haruki Yamamori、Kousuke Ohashi、Mitsuhiro Okimoto、Masayuki Hoshi、Takashi Yoshida
DOI:10.1080/00397911.2012.667184
日期:2013.7.3
Abstract Several ketone N-phenylsemicarbazones were electrooxidized in the presence of potassium iodide and a base using methanol as the solvent to give nearly commensurate amounts of methyl N-phenylcarbamate and the corresponding dimethyl acetals. Continuous evolution of gaseous nitrogen was observed from the anolyte during the electrooxidation. The reactions were carried out under very mild reaction
A simple and efficient procedure for the synthesis of ethyl 2-methylthio- and ethyl 2-benzylthio-6-methyl(aryl)-pyrimidine-4-carboxylates and their corresponding acid derivatives is reported. The products are obtained in good yields via the cyclocondensation reaction of ethyl 4-alkoxy-2-oxo-4-methyl(aryl)-but-3-enoates with 2-methylisothiourea sulfate or 2-benzylisothiourea hydrochloride, under mild
Bismuth Subnitrate-Catalyzed Markovnikov-Type Alkyne Hydrations under Batch and Continuous Flow Conditions
作者:Zsanett Szécsényi、Ferenc Fülöp、Sándor B. Ötvös
DOI:10.3390/molecules26102864
日期:——
subnitrate is reported herein as a simple and efficient catalyst for the atom-economical synthesis of methyl ketones via Markovnikov-type alkyne hydration. Besides an effective batch process under reasonably mild conditions, a chemically intensified continuousflow protocol was also developed in a packed-bed system. The applicability of the methodologies was demonstrated through hydration of a diverse