Synthesis of 3,3-disubstituted α-tetralones by rhodium-catalysed reaction of 1-(2-haloaryl)cyclobutanols
作者:Naoki Ishida、Shota Sawano、Masahiro Murakami
DOI:10.1039/c2cc16907j
日期:——
The rhodium-catalysed reaction of 1-(2-haloaryl)cyclobutanols afforded 3,3-disubstituted α-tetralones. The reaction was applied to the asymmetric synthesis of α-tetralones bearing a chiral quaternary carbon centre at the 3-position, which was otherwise difficult to execute.
(R)-(+)-[VCD(-)984]-4-Ethyl-4-methyloctane: A Cryptochiral Hydrocarbon with a Quaternary Chiral Center. (2) Vibrational CD Spectra of Both Enantiomers and Absolute Configurational Assignment
the VCD spectral curves were mirror images of each other. Based on the observed positive VCD band at 984 cm -1 for (S)-(-)-1, its absoluteconfiguration was fully designated as (S)-(-)-[VCD(+)984]-1. The VCD spectrum was quantum chemically calculated by the DFT MO method at the B3PW91/6-31G(d,p) level, and the simulated VCD curve for (S)-1 agreed very well with the observed VCD spectrum of (S)-(-)-1