102225-88-7Relevant articles and documents
Examination of spacer effects on stereochemical recognition of a remote sterically hindered chiral center in lipase-catalyzed acylation
Kobayashi, Ryohei,Huang, Hanghang,Hamada, Manabu,Higashi, Toshinori,Shoji, Mitsuru,Sugai, Takeshi
, p. 52 - 57 (2012/09/08)
To date, the enzyme-catalyzed kinetic resolution of the secondary alcohol [Ar-C*H(CH3)OH, Ar = 2′,4′,6′- triisopropylphenyl] has not been available, due to high steric hindrance around the hydroxy group. To achieve resolution, the reaction site was extended by the introduction of two kinds of spacers, [-C(=O)CH2] and [-C(=O)C**HCN]. In the first substrate, the recognition of remote chirality [Ar-C*H(CH3)O-C(=O)CH2OH] by acylation with Burkholderia cepacia lipase was examined by changing reaction conditions and acyl donors. An E = 22 in the preference of (1′R)-isomer, was recorded with vinyl acetate as an acyl donor at 25 °C. In the second substrate, there was a matched enantiomeric pair [stereoselective ratio at C-1′ = 15, in the preference of (1′R)-isomer] and a mismatched pair [stereoselective ratio at C-1′ = 2.5, in the preference of (1′S)-isomer] based on the relative stereochemistry between the two chiral centers [Ar- C*H(CH3)O-C(=O)C**HCN-OH].
Efficient, large-scale preparation of (R)- and (S)-1-(2,4,6-triisopropylphenyl)ethanol, versatile chiral auxiliary for cyclopentenone, γ-butyrolactone, and γ-butyrolactam synthesis
Delair, Philippe,Kanazawa, Alice M.,De Azevedo, Mariangela B.M.,Greene, Andrew E.
, p. 2707 - 2710 (2007/10/03)
A particularly efficacious, low-cost preparation of both (R)- and (S)-triisopropylphenyl)-ethanol, useful chiral controllers in the dichloroketene-enol ether cycloaddition reaction, has been developed.
