Stereoselective reduction of the ketone group in α-allyl β-keto esters
作者:V. I. Boev、A. I. Moskalenko、S. L. Belopukhov、N. M. Przheval’skii
DOI:10.1134/s1070428015090067
日期:2015.9
Stereoselective reduction of the ketone carbonyl group in alpha-allyl-substituted beta-keto esters with sodium tetrahydridoborate in the presence of 2 equiv of MnCl2 quantitatively afforded the corresponding syn-isomeric alcohols. The reduction of the same substrates with L-selectride [LiBH(s-Bu)(3)] in anhydrous THF was characterized by low chemoselectivity, and anti-isomeric alcohols were formed in about 50% yield. Under analogous conditions, alpha-allyl ketones smoothly reacted with L-selectride to give syn-isomeric alcohols in quantitative yield. The corresponding anti isomers were synthesized by the Mitsunobu reaction of the syn isomers with formic acid, followed by alkaline hydrolysis.
Synthesis of Biaryls via AlCl<sub>3</sub>Catalyzed Domino Reaction Involving Cyclization, Dehydration, and Oxidation
developed to synthesize biaryls from substituted acetophenones, phenylacetones, dihydrochalcone, and 2-acetylnaphthalene in reasonably good yields at room temperature via a domino reaction sequence of AlCl3catalyzed cyclization, dehydration, and then oxidation.