The Ullmanncoupling of 1-bromo-2-naphthoates of C-chiral alcohols of R- and S-configuration induced axialdissymmetry of R- and S-chirality, respectively, in the newly formed 1,1′-bond of the binaphthyls; the optical yield amounted up to 13% where the chiral alcohol was l-menthol.
Stable benzylic carbocations were generated via mesolytic cleavage of TEMPO-derived alkoxyamines, which was realized by electrochemicaloxidation. This strategy provided an efficient and unique approach to access stabilized carbocations under mild conditions. Esterification of benzylic carbocations using carboxylic acid produced a variety of benzylic esters with a broad substrate scope and excellent
稳定的苄基碳阳离子是通过 TEMPO 衍生的烷氧基胺的介观裂解产生的,这是通过电化学氧化实现的。该策略提供了一种在温和条件下获得稳定碳正离子的有效且独特的方法。使用羧酸酯化苄基碳正离子可产生多种具有广泛底物范围和优异官能团相容性的苄酯。
Fatty and aromatic acids as acyl donors in enzymatic kinetic resolution of phenylethanol and 1-phenylpropan-2-ol
The use of fatty and aromatic acids as green acyl donors for enzymatic kinetic resolution via esterification of 1-phenylethanol and 1-phenylpropan-2-ol was described. The impact of the presence of magnesium sulfate on both reactivity and selectivity of Candidarugosalipase (CRL) was checked. The organic solvents, the medium dilution, and the temperature revealed as determinant parameters to achieve