Asymmetric Diels-Alder Reaction of Unsymmetrical Maleates. A Chemical Access to Chiral, Unsymmetrical cis-Cyclohexene-1,2-dicarboxylates
摘要:
A new route to optically active, unsymmetrical cis-cyclohexene-1,2-dicarboxylate derivatives has been developed on the basis of the asymmetric Diels-Alder reaction of chiral, unsymmetrical maleates catalyzed by certain Lewis acids. A notably high level of asymmetric induction has been observed in the asymmetric Diels-Alder reaction of unsymmetrical maleates possessing chiral auxiliaries such as alpha-phenethyl and trans-2-phenylcyclohexyl groups. The origin of the chiral outcome using these dienophiles has been elucidated.
First example of hydrolytic kinetic resolution of acrylate of secondary alcohols by lipase Amano AK
作者:Pranjal P. Bora、Ghanashyam Bez、Jasha Momo H. Anal
DOI:10.1016/j.molcatb.2011.06.015
日期:2011.11
Lipase Amano AK is found to be extremely efficient catalyst for hydrolytic kinetic resolution of acrylates of secondary alcohols in aqueous phosphate buffer at pH 7.0. Both aliphatic and benzylic secondary alcohols show good to excellent E values. (C) 2011 Elsevier B.V. All rights reserved.