resolution (AKR) of racemic terminal epoxides using carbamates as the nucleophile catalyzed by (salen)Co(III) complex provides a practical and straightforward method for the synthesis of both aliphatic and aromatic N-Boc- or N-Cbz-protected 1,2-amino alcohols in almost enantiomerically pure form (ee >/= 99%). The AKR uses an easily accessible catalyst and inexpensive starting materials, and the reactions are
Highly Efficient Recyclable Co<sup>III</sup>-salen Complexes in the Catalyzed Asymmetric Aminolytic Kinetic Resolution of Aryloxy/Terminal Epoxides for the Simultaneous Production of<i>N</i>-Protected 1,2-Amino Alcohols and the Corresponding Epoxides in High Optical Purity
作者:Rukhsana I. Kureshy、K. Jeya Prathap、Santosh Agrawal、Manish Kumar、Noor-ul H. Khan、Sayed H. R. Abdi、Hari C. Bajaj
DOI:10.1002/ejoc.200900032
日期:2009.6
Chiral CoIII–salencomplexes 1–6 bearing different substituents at the 3,3′- and 5,5′-positions of the salen unit, namely H, tBu, morpholinomethyl, and piperidinomethyl, have been synthesized. These complexes were used as catalysts in an environmentally benign protocol for the highly enantioselective aminolytickineticresolution (AKR) of racemic aryloxy/terminalepoxides with various carbamates as