Applications of the Baylis-Hillman Adducts in Organic Synthesis: A Facile Synthesis of [<i>E</i>]-α-Cyanocinnamyl Alcohols and [<i>E</i>]-α-Cyanocinnamic Aldehydes
Aqueous sulfuric acid mediated transformation of the Baylis-Hillman adducts, i.e. 3-aryl-3-hydroxy-2-methylenepropanenitriles, into [E]-α-cyanocinnamyl alcohols and subsequent oxidation with PCC leading to the formation of stereochemically pure [E]-α-cyanocinnamic aldehydes, which represents an efficient alternative route to the Knoevenagel condensation reaction, is described.
A Simple Route to 3-Substituted 2-Cyano Allylic Alcohols
作者:Mouna Aiai、Michèle Baudy-Floc’h、Albert Robert、Philippe Le Grel
DOI:10.1055/s-1996-4214
日期:1996.3
The first original and simple route to 3-substituted 2-cyano allylic alcohols with very good yields is described. The epoxide function in the key step acts as a protecting group during the synthesis of these allylic alcohols.
Electrochemical, Regioselective, and Stereoselective Synthesis of Allylic Thioethers and Selenoethers under Transition-Metal-Free and Oxidant-Free Conditions
coupling protocol between allylic iodides and disulfides/diselenides for the formation of C–S/Se bonds in the absence of transition metals, bases, and oxidants. The stereochemically different densely functionalized allylic iodides gave regio- and stereoselective diverse thioethers in good yields. This strategy demonstrates a sustainable promising approach for the synthesis of allylic thioethers in 38–80%
A simple protocol for the synthesis of a piperidine-2,6-dione framework from Baylis–Hillman adducts
作者:Deevi Basavaiah、Dandamudi V. Lenin、Badugu Devendar
DOI:10.1016/j.tetlet.2009.03.038
日期:2009.7
3-Hydroxy-2-methylenealkanenitriles, the Baylis-Hillman alcohols, derived from various aldehydes and acrylonitrile, have been conveniently transformed into 3-arylidene(or alkylidene)piperidine-2,6-diones in an operationally simple one-pot multi-step process involving Johnson-Claisen (J-C) rearrangement, partial hydrolysis, and cyclization. Rearranged Baylis-Hillman alcohols, (E)-2-hydroxymethyl-3-arylprop-2-enenitriles, have been converted into 4-aryl-3-methylidenepiperidine-2,6-diones in a similar reaction sequence. 4-Aryl-3,5-dimethylidenepiperidine-2,6-dione derivatives have been synthesized from Baylis-Hillman compounds, 3-aryl-4-cyano-2-methoxycarbonylpenta-1,4-dienes, obtained via the Baylis-Hillman reaction of methyl (2Z)-2-(bromomethyl)-3-arylprop-2-enoates with acrylonitrile, in a one-pot process. (C) 2009 Elsevier Ltd. All rights reserved.
First sharpless epoxidation of electrophilic 2-cyanoallylic alcohols
作者:Mouna Aiai、Albert Robert、Michèle Baudy-Floc'h、Philippe Le Grel
DOI:10.1016/0957-4166(95)00300-e
日期:1995.9
For the first time we describe the synthesis of asymmetric cyano epoxy alcohols in good yield and high enantiomeric excess via a Sharpless epoxidation of electrophilic 2-cyanoallylic alcohols.