Abstract
In order to develop an efficient organocatalyst for the enantioselective N-H insertion reaction via carbene/carbenoid, the catalytic core of the cinchona alkaloids was investigated. According to our working hypothesis of an eight-membered ring transition state in the N-H insertion reaction, two pairs of enantiomers related to 2-amino-1-phenylethanol were investigated for their chiral inducing potential. Since both (1R,2S)-isomers gave the N-phenyl-1-phenylglycine derivative enriched in the R-form, while their enantiomers gave the S-form, the 2-amino-1-phenylethanol structure is concluded to be the catalytic core of the cinchona alkaloid in the enantioselective N-H insertion reaction via rhodium(II) carbenoid.
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