The chemistry of acylals. Part I. The reactivity of acylals towards Grignard and organolithium reagents
作者:Leiv K. Sydnes、Marcel Sandberg
DOI:10.1016/s0040-4020(97)00789-8
日期:1997.9
been prepared and reacted with Grignard and alkyllithium reagents. Acylals from formaldehyde furnished complex reaction mixtures when reacted with both reagents. Acylals of other aldehydes gave reaction mixtures that consisted mainly of an ester, generated by replacing one of the carboxy groups with the organic part of the organometallic reagent, and regenerated aldehyde. The esters were formed in the
Chemoselective synthesis and deprotection of 1,1-diacetates have been performed in good yields and in the absence of any solvent by zeolite HSZ-360 as a new reusable catalyst.
The Chemistry of Acylals. 3. Cyanohydrin Esters from Acylals with Cyanide Reagents
作者:Marcel Sandberg、Leiv K. Sydnes
DOI:10.1021/ol005535b
日期:2000.3.1
[reaction: see text] When treated with KCN in DMSO at room temperature, acylals from aliphatic aldehydes gave the corresponding cyanohydrin esters in good to excellent yields. Acylals from aromatic aldehydes were less reactive and gave several byproducts in addition to fair yields of cyanohydrin under the same conditions. Trimethylsilyl cyanide mixed with titanium(IV) chloride afforded cyanohydrin