A novel Mannich-typereaction of alkenyltrichloroacetates with aldimines has been realized by usingdibutyltindimethoxide as a catalyst, which is regenerated by addition of methanol. A three-component coupling reaction of aldehydes, primary amines, and alkenyltrichloroacetates has been also efficiently achieved. These procedures can provide a variety of β-amino ketones not only from aromatic aldehydes
Selective Synthesis of α,β-Unsaturated Ketones by Dibutyltin Dimethoxide-Catalyzed Condensation of Aldehydes with Alkenyl Trichloroacetates
作者:Akira Yanagisawa、Riku Goudu、Takayoshi Arai
DOI:10.1021/ol0482700
日期:2004.11.1
Various alpha,beta-unsaturated ketones were stereoselectively synthesized in high yields up to 94% by a condensation reaction between alkenyl trichloroacetates and aldehydes using dibutyltin dimethoxide as a catalyst in the presence of methanol. This process is superior to the classical Claisen-Schmidt condensation with respect to mildness of the base catalyst and product selectivity.
Enantioselective Nitroso Aldol Reaction Catalyzed by QuinoxP*·Silver(I) Complex and Tin Methoxide
作者:Akira Yanagisawa、Satoshi Takeshita、Youhei Izumi、Kazuhiro Yoshida
DOI:10.1021/ja910588w
日期:2010.4.21
A catalytic enantioselective O-nitroso aldol reaction of alkenyl trichloroacetates with nitrosoarenes was achieved using the (R,R)-t-Bu-QuinoxP*.AgOAc complex as the chiral catalyst and Bu(2)Sn(OMe)(2) as the achiral cocatalyst in the presence of methanol. Optically active alpha-aminooxy ketones with up to 99% ee were regioselectively obtained in high yields from various alkenyl trichloroacetates of
使用 (R,R)-t-Bu-QuinoxP*.AgOAc 配合物作为手性催化剂和 Bu(2)Sn(OMe)(2) 作为手性催化剂,实现了烯基三氯乙酸酯与亚硝基芳烃的催化对映选择性 O-亚硝基羟醛反应在甲醇存在下的非手性助催化剂。具有高达 99% ee 的光学活性 α-氨基氧基酮以高产率从环酮的各种烯基三氯乙酸酯中获得。
Thieme Chemistry Journal Awardees - Where
are They Now? Dibutyltin Dimethoxide Catalyzed <i>N</i>-Nitrosoaldol Reaction of
Alkenyl Trichloroacetate
Nitrosoaldol reaction between alkenyltrichloroacetates and nitrosobenzene has been achieved usingdibutyltindimethoxide as a catalyst, which is regenerated in the presence of methanol. The corresponding α-hydroxyamino ketones (N-adducts) have exclusively formed not only from cyclic alkenyltrichloroacetates but also from acyclic ones.
Michael Addition Reaction of Alkenyl Trichloroacetates Catalyzed by Dibutyltin Dimethoxide
作者:Akira Yanagisawa、Youhei Izumi、Takayoshi Arai
DOI:10.1246/cl.2008.1092
日期:2008.10.5
The Michael addition of alkenyltrichloroacetates to p-benzoquinone was achieved usingdibutyltindimethoxide as a catalyst in a mixed solvent consisting of THF and MeOH. Various monoalkylated benzoquinone derivatives were obtained from cyclic and acyclic trichloroacetates in moderate yield. trans-β-Nitrostyrene was also a favorable electrophile in this catalytic process, which gave an expected Michael