Preparation and rearrangement of some conjugated phenylsulphinylacetate derivatives
作者:Quezia B. Cass、Albert A. Jaxa-Chamiec、Peter G. Sammes
DOI:10.1039/c39810001248
日期:——
The direct condensation of saturated or un-saturated aldehydes with methyl phenylsulphinylacetate can be effected with the products undergoing base catalysed rearrangements those from saturated aldehydes yielding γ-hydroxy-αβ-unsaturated esters, whilst croton-aldehyde gives rise to methyl 6-phenylsulphinylhexa-2,4-dienoate.
Preparation of (R)- and (S)-(E)-4-hydroxy-2-unsaturated acids by asymmetric hydrolysis of their racemic esters
作者:Pietro Alevi、Mario Anastasia、Pierangela Ciuffreda、Anna Maria Sanvito
DOI:10.1016/s0957-4166(00)80324-9
日期:1993.7
Several optically active (R)- and (S)-(E)-4-hydroxyalk-2-enoic acids, metabolites of bioactive compounds of lipid peroxidation, were prepared from the corresponding racemic methyl esters by enantioselective hydrolysis mediated by porcine pancreas lipase and porcine liver esterase.
Kaji, Aritsune, Phosphorus and Sulfur and the Related Elements, 1985, vol. 23, p. 211 - 222
作者:Kaji, Aritsune
DOI:——
日期:——
Stereochemical Dependence of Base-Catalyzed Cleavage of Cyclic Peroxy Ketals
作者:Barry B. Snider、Zhongping Shi、Steven V. O'Neil、Kevin D. Kreutter、Tracy L. Arakaki
DOI:10.1021/jo00086a022
日期:1994.4
Base-catalyzed decomposition of cyclic peroxy ketals 1c, 2c, 14, and 16 shows a strong stereochemical dependence. Isomers 2c and 16 with a pseudoequatorial hydrogen undergo a fast antiperiplanar E2 elimination to afford ene diones 4 and 17 that react further. Ester 1c, with a pseudoaxial hydrogen and a pseudoequatorial acetate side chain, reacts slowly to form the enolate, which undergoes an S(N)2 reaction to give epoxide 3. Peroxy ketals 14 and 15 are stable in base. Peroxy acetals 19 and 20 undergo a faster E2 elimination with loss of the pseudoequatorial acetal proton to provide alkoxide ester 21 that reacts further.
Aerobic conversion of organic halides to alcohols. An oxygenative radical cyclization