Heterocyclylmethyl-substituted pyrazole derivatives and their use for
申请人:Bayer Aktiengesellschaft
公开号:US06166027A1
公开(公告)日:2000-12-26
The present invention relates to new heterocyclylmethyl-substituted pyrazole derivatives, processes for their preparation and their use as medicaments, in particular as medicaments for treatment of cardiovascular diseases.
Direct anodic (thio)acetalization of aldehydes with alcohols (thiols) under neutral conditions, and computational insight into the electrochemical formation of the acetals
A versatile protocol for the production of acetals/thioacetals by means of direct electrochemical oxidation is developed here under neutral conditions, providing (thio)acetals with good functional group tolerance and a wide scope for both aldehydes and (thio)alcohols. DFT calculations reveal that direct electron transfer from the anode plays a key role in carbonyl activation during this acid free acetalization
Chemoselective thioacetalisation and transthioacetalisation of carbonyl compounds catalysed by tetrabutylammonium tribromide (TBATB)Dedicated to Professor Subramanian Ranganathan on the occasion of his 70th birthday.
作者:Sarala Naik、Rangam Gopinath、Mousumi Goswami、Bhisma K. Patel
DOI:10.1039/b402648a
日期:——
Thioacetals and thioketals of various aldehydes and ketones were obtained directly from carbonylcompounds or by a transthioacetalisation process from cyclic O,O-acetals in the presence of dithiols and a catalytic amount of tetrabutylammonium tribromide (TBATB). Chemoselective thioacetalisation of aromatic aldehydes containing an electron-donating group in the presence of an aldehyde containing an
A Combined Experimental–Theoretical Study on Diels‐Alder Reaction with Bio‐Based Furfural: Towards Renewable Aromatics
作者:I Scodeller、Karine De Oliveira Vigier、Eric Muller、Changru Ma、Frédéric Guégan、Raphael Wischert、François Jérôme
DOI:10.1002/cssc.202002111
日期:2021.1.7
The synthesis of relevant renewable aromatics from bio‐based furfural derivatives and cheap alkenes is carried out by using a Diels‐Alder/aromatization sequence. The prediction and the control of the ortho/meta selectivity in the Diels‐Alder step is an important issue to pave the way to a wide range of renewable aromatics, but it remains a challenging task. A combined experimental‐theoretical approach
Tetrabutylammonium Tribromide (TBATB) as An Efficient Generator of HBr for an Efficient Chemoselective Reagent for Acetalization of Carbonyl Compounds
作者:Rangam Gopinath、Sk. Jiaul Haque、Bhisma K. Patel
DOI:10.1021/jo025701o
日期:2002.8.1
Acyclic and cyclic acetals of various carbonyl compounds were obtained in excellent yields under a mild reaction condition in the presence of trialkyl orthoformate and a catalytic amount of tetrabutylammonium tribromide (TBATB) in absolute alcohol. Chemoselective acetalization of an aldehyde in the presence of ketone, unsymmetrical acetal formation, shorter reaction times, mild reaction conditions