1,3-Benzodithiole tetraoxide (BDT) 4 is more reactive in alkylation reactions than the commonly used bis(benzenesulfonyl)methane (1). This is demonstrated notably in dialkylations with sterically demanding alkyl halides. Besides its ready access and larger scope of applications, BDT has two other advantages over 1, a lower molecular weight and higher crystallinity of its alkylated derivatives. As in
Asymmetric hydroformylation of 1,2-dialkyl olefins was reported. In order to increase the enantiomeric induction, steric auxiliary sulfonyl groups were introduced. Using a Rh/Yanphos complex as catalyst, chiral aldehydes were obtained with high enantioselectivities under mild pressure. The easily removable auxiliary made this method a powerful tool in the preparation of important enantiopure building
Rhodium‐Catalyzed Benzylic Addition Reactions of Alkylarenes to Michael Acceptors
作者:Yuntong Li、Wen‐Qiang Wu、Hui Zhu、Qi‐Kai Kang、Lun Xu、Hang Shi
DOI:10.1002/anie.202207917
日期:2022.8.26
A rhodium catalyzed benzylic C(sp3)− C(sp3) bond formation with Michaelacceptors was achieved. The catalyst is proposed to activate the aromatic ring via η6-coordination, dramatically facilitating benzylic deprotonation and addition of the resulting carbanion to the electrophile in the absence of a base. This byproduct-free method features a wide scope of alkylarenes bearing primary, secondary, or