Palladium/Rhodium Cooperative Catalysis for the Production of Aryl Aldehydes and Their Deuterated Analogues Using the Water–Gas Shift Reaction
作者:Malek Y. S. Ibrahim、Scott E. Denmark
DOI:10.1002/anie.201806148
日期:2018.8.6
to effect the reductive carbonylation of arylhalides in moderate to good yield. In this reaction, water is the hydride source, and CO serves both as the carbonyl source and the terminal reductant through the water–gas shift reaction. The catalytic generation of the Rh hydride allows for the selective formation of highly hindered aryl aldehydes that are inaccessible through previously reported reductive
Electronic Effects in the Pt-Catalyzed Cycloisomerization of Propargylic Esters: Synthesis of 2,3-Disubstituted Indolizines as a Mechanistic Probe
作者:Alison R. Hardin、Richmond Sarpong
DOI:10.1021/ol701973s
日期:2007.10.1
[GRAPHICS]The initial 5-exo versus 6-endo cyclization of the acyl group onto the activated alkyne of propargylic esters has been found to be dependent on electronic effects of the acyl, alkyne, and propargylic carbon substituents. These electronic effects control the ratio of 2,3-disubstituted versus 1,3-disubstituted indolizine products formed when substrates bearing pyridines at the alkyne terminus are used.
US7858831B2
申请人:——
公开号:US7858831B2
公开(公告)日:2010-12-28
Computational and experimental structure–reactivity relationships: evidence for a side reaction in Alpine-Borane reductions of d-benzaldehydes
作者:Hui Zhu、N. Soledad Reyes、Matthew P. Meyer
DOI:10.1016/j.tetlet.2009.09.109
日期:2009.12
borabicyclo[3.3.1]nonane (Alpine-Borane). This is likely because of the extreme size disparity of groups on either side of the carbonyl. Here, we present a structure-reactivity study whereby the reductions of variably substituted d-benzaldehydes are explored using highly sensitive measures for enantiomeric excess and relative reactivity. These results are compared to the relativerates predicted from
GENERAL METHOD FOR INCREASING STEREOSELECTIVITY IN STEREOSELECTIVE REACTIONS
申请人:Meyer Matthew P.
公开号:US20090163741A1
公开(公告)日:2009-06-25
This invention is directed to a method of performing a stereoselective reaction without use of a solvent comprising contacting a reactant with a chiral reagent under sonication conditions to form an excess of an enantiomer.