Complete Stereoretention in the Rhodium-Catalyzed 1,2-Addition of Chiral Secondary and Tertiary Alkyl Potassium Trifluoroborate Salts to Aldehydes
作者:Abel Ros、Varinder K. Aggarwal
DOI:10.1002/anie.200901900
日期:——
Take your new partner by the hand: Chiralsecondary and tertiaryalkyltrifluoroboratesalts undergo rhodium‐catalyzed 1,2‐addition to aldehydes with completestereoretention (handedness) in all cases, enabling the creation of quaternary stereogenic centers with essentially perfect enantioselectivity (see scheme; cod=cycloocta‐1,5‐diene).
LITHIATED PRIMARY ALKYL CARBAMATES FOR THE HOMOLOGATION OF BORONIC ESTERS
作者:Webster, Matthew P.、Partridge, Benjamin M.、Aggarwal, Varinder K.
DOI:10.15227/orgsyn.088.0247
日期:——
A Catalytic Enantiotopic-Group-Selective Suzuki Reaction for the Construction of Chiral Organoboronates
作者:Chunrui Sun、Bowman Potter、James P. Morken
DOI:10.1021/ja500029w
日期:2014.5.7
Catalytic enantiotopic-group-selective cross-couplings of achiral geminal bis(pinacolboronates) provide a route for the construction of nonracemic chiral organoboronates. In the presence of a chiral monodentate taddol-derived phosphoramidite ligand, these reactions occur with high levels of asymmetric induction. Mechanistic experiments with chiral B-10-enriched geminal bis(boronates) suggest that the reaction occurs by a stereochemistry-determining transmetalation that occurs with inversion of configuration at carbon.
Lithiated Carbamates: Chiral Carbenoids for Iterative Homologation of Boranes and Boronic Esters
作者:Jake L. Stymiest、Guillaume Dutheuil、Adeem Mahmood、Varinder K. Aggarwal