153993-95-4Relevant academic research and scientific papers
Asymmetric synthesis of benzilic acid analogues using 8-phenylmenthol as a chiral auxiliary
Kiesewetter
, p. 2183 - 2198 (2007/10/02)
Our program on the synthesis of 18F-labeled muscarinic receptor ligands required the preparation of chiral fluoroalkyl benzilic acids. An enantioselective synthesis of substituted benzilic acids was achieved using 8-phenylmenthol as the chiral auxiliary. Grignard addition to the si face of 8-phenylmenthyl benzoylformate 7 proceeded with high selectivity. The results of the chiral induction support assignments of the chirality of benzilic acids previously resolved by crystallization. The method was used to synthesize (R)-quinuclidinyl-(R)-4-iodo)benzilate, which proved identical to an authentic sample. In addition, the method allows the preparation of (R)- and (S)-fluoroethyl benzilic acids in a stereoselective manner.
