A new strategy has been established for the kineticresolution of racemic allylic alcohols through a palladium/sulfonyl‐hydrazide‐catalyzed asymmetric OH‐substitution under mild conditions. In the presence of 1 mol % [Pd(allyl)Cl]2, 4 mol % (S)‐SegPhos, and 10 mol % 2,5‐dichlorobenzenesulfonyl hydrazide, a range of racemic allylic alcohols were smoothly resolved with selectivity factors of more than
Carbonylative cross-coupling reaction of aryl iodides with alkylaluminums by palladium complex catalysis
作者:Yoshiaki Wakita、Tomoyuki Yasunaga、Masaharu Kojima
DOI:10.1016/0022-328x(85)80118-2
日期:1985.6
and/or tertiary alcohols and unsymmetrical ketones have been obtained in moderate to good yields by the palladium-catalyzed (5 mol%) carbonylative coupling of aryl iodides with alkylaluminum compounds under very mild conditions (20–50°C, 1 atm of carbon monoxide). The type of the reaction product depended on the aluminum reagent employed. While the selective formation of secondary alcohols was observed
Carbanions α to (alkoxy)silyl or (amino)silyl groups act as nucleophilic α-hydroxy-alkylating agents for organic halides and epoxides via the metal catalyzed coupling reaction and the subsequent oxidative cleavage of the carbon-silicon bond.
2-carbofunctionalization strategy for conjugateddienes has been developed. No exogenous photocatalyst or additives are required in this mild protocol and it allows for highly regioselective and efficient 1,2-carboisothiocyanation through the coupling of a diene, an alkyl radical and TMSNCS. The reaction is proposed to proceed through EDA complexation between the diene and TMSNCS.