Direct Synthesis of Nitriles from Aldehydes Using an O-Benzoyl Hydroxylamine (BHA) as the Nitrogen Source
摘要:
The direct synthesis of nitriles from commercially available or easily prepared aldehydes has been achieved. O-(4-CF3-benzoyl)-hydroxylamine (CF3-BHA) was utilized as the nitrogen source to generate O-acyl oximes in situ with aldehydes, which can be converted to a nitrile with the assistance of a Bronsted acid. Several aliphatic, aromatic, and alpha,beta-unsaturated nitriles that contain different functional groups were prepared in high yields (up to 94% yield). This method has notable advantages, such as simple and mild conditions, high yields, and good functional group tolerance.
We have developed an easy and practical method for the synthesis of α,β-unsaturated oximes and nitriles from readily available propargylic alcohols with hydroxylaminehydrochloride (NH2OH·HCl) under metal-free conditions. By using or not using p-toluenesulfonyl chloride (p-TsCl) as the dehydrating promoter, the desired nitriles or oximes could be obtained, respectively via a three-step one-pot or two-step
β-unsaturated amides and alkenyl nitriles from readily available propargylic alcohols. The reaction proceeded smoothly under the neutral conditions with hydroxylaminehydrochloride (NH2OH·HCl) as the nitrogen source. The development of these new strategies has significantly extended the application of hydroxylaminehydrochloride to the chemistry of propargylic alcohols. Moreover, both secondary and tertiary alcohols
A 9,10-dicyanoanthracene (DCA)-photosensitized reaction of 3-cyano- or 3-ethoxy-2,2-diarylthietane in acetonitrile gave selectively 2-cyano- or 2-ethoxy-1,1-diarylethene. The ring-splitting reaction proceeds via a one-electron oxidation of the sulfur atom of thietane ring by a photochemical electron transfer to the excited singlet state of DCA.
Nontoxic cyanide source: An unprecedented route to acrylonitriles by employing propargylic alcohols and para‐tolylsulfonohydrazide as a combined cyanosource has been developed (see scheme). This efficient and practical cyanation reaction proceeds through an FeCl3‐catalyzed domino propargylic substitution/aza‐Meyer–Schuster rearrangement sequence, the rearrangement process of which is reported for
Derivatives of urea and related diamines, methods for their manufacture, and uses therefor
申请人:DePrez Pierre
公开号:US20080125424A1
公开(公告)日:2008-05-29
The present invention relates generally to compounds represented in Formula I, pharmaceutical compositions comprising them and methods of treating of diseases or disorders related to the function of the calcium sensing receptor. The invention also relates to processes for making such compounds and to intermediates useful in these processes.