Intermolecular Rhodium(II)-Catalyzed Reactions with Silicon-Substituted Carbonyl Ylides
作者:Carsten Bolm、Sandra Saladin、Andrey Kasyan
DOI:10.1021/ol026987m
日期:2002.12.1
[reaction: see text] The Rh(II)-catalyzed reaction of benzyl 2-trialkylsilyl-2-diazoacetates with various acyclic and cyclic ketones affords novel dioxolanones via silicon-substituted carbonyl ylides in up to 98% yield.
The rhodium-catalysed synthesis of pyrrolidinone-substituted (trialkylsilyloxy)acrylic esters
作者:Daniel L. Priebbenow、Carsten Bolm
DOI:10.1039/c3ra41527a
日期:——
A method for the preparation of novel pyrrolidinesubstituted (trialkylsilyloxy)acrylic esters has been developed. The protocol involves a rhodium-catalysed O-insertion/rearrangement reaction between N-functionalised 2-pyrrolidinones and α-silyl α-diazoacetates to form the corresponding acrylic esters in moderate to high yields.
Diastereoselective Synthesis of Pentasubstituted γ-Butyrolactones from Silyl Glyoxylates and Ketones through a Double Reformatsky Reaction
作者:Stephen N. Greszler、Jeffrey S. Johnson
DOI:10.1002/anie.200900215
日期:2009.5.4
Three contiguous stereocenters can be established with remarkable diastereoselectivity in a doubleReformatsky sequence. Densely functionalized γ‐butyrolactones were assembled rapidly by this approach, in which a ketone is used as the terminal electrophile (see scheme). Secondary transformations of the lactone products enhance their synthetic utility. R1=Me, H; R2=alkyl, aryl, CF3; Bn=benzyl, TBS=
Rhodium-catalyzed oxygen transfer was used to generate benzyl 2-sifyi-2-oxoacetates in good yields. The hydrogenation of these compounds led to chiral alpha-silyl-substituted a-hydroxyacetic acids. Resolution by means of HPLC using a chiral stationary phase afforded an enantiomerically pure representative of this class of compounds, which was successfully applied as a chiral ligand in an asymmetric aldol-type reaction.