Lithium Perchlorate Catalyzed Acetylation of Alcohols under Mild Reaction Conditions
作者:Yasuyuki Nakae、Ikuko Kusaki、Tsuneo Sato
DOI:10.1055/s-2001-17483
日期:——
Lithium perchlorate is found to efficiently catalyze the acetylation of alcohols and phenols with acetic anhydride in good to excellent yields.
高氯酸锂被发现能有效催化醇和酚与乙酸酐的乙酰化反应,产率从良好到优秀。
A mild aldol reaction of aryl aldehydes through palladium-catalyzed hydrosilation of α,β-unsaturated carbonyl compounds with trichlorosilane
作者:Syun-ichi Kiyooka、Atsushi Shimizu、Seiko Torii
DOI:10.1016/s0040-4039(98)01030-2
日期:1998.7
A mild aldol reaction of aryl aldehydes took place by using N,N-dimethylacrylamide and trichlorosilane with a catalytic amount of tetrakis(triphenyl-phosphine)palladium. a unique anti selectivity was observed in the reaction.
A Mn‐catalyzed diastereo‐ and enantioselective hydrogenation of α‐substituted β‐ketoamides has been realized for the first time under dynamic kinetic resolution conditions. anti‐α‐Substituted β‐hydroxy amides, which are useful building blocks for the synthesis of bioactive molecules and chiral drugs, were prepared in high yields with excellent selectivity (up to >99 % dr and >99 % ee) and unprecedentedly
Chemistry of Enoxysilacyclobutanes: Highly Selective Uncatalyzed Aldol Additions
作者:Scott E. Denmark、Brian D. Griedel、Diane M. Coe、Mark E. Schnute
DOI:10.1021/ja00095a004
日期:1994.8
O(Silacyclobuty1) ketene acetals derived from esters, thiol esters, and amides underwent facile aldol addition with a variety of aldehydes at room temperature without the need for catalysts. The uncatalyzed aldol addition reaction of O(silacyclobuty1) ketene acetals displayed the following characteristics: (1) the rate of reaction was highly dependent on the spectator substituent on silicon and the
Treatment of α-formyl amides with RAlCl2 or PhAlCl2 provided threo-α-alkyl-substituted β-hydroxy amides under high stereocontrol. The method was successfully applied to the selective addition of alkyl group to α-methyl-substituted β-keto amides or esters. Treatment of α-methyl-β-keto amides or α-methyl-β-keto esters with trialkylaluminium or alkylmanganese halide afforded the corresponding erythro (or threo) α-methyl-substituted β-hydroxy amides or α-methyl-substituted β-hydroxy esters with high stereoselectivity.