Synthesis of alkyl (α-phenylthioalkenyl) ketones containing a (Z)-trisubstituted olefinic fragment
摘要:
Warren's method, which has been proposed for the synthesis of alpha-phenylthiodialkyl ketones, appeared to be inefficient for the preparation of their alkenyl alkyl analogs. The latter were prepared in good yields by alkenylation of alkyl phenylthiomethyl ketones with alkenyl bromides.
Kinetic resolutions in anti aldol reactions with racemic 2-phenylthio aldehydes: asymmetric synthesis of cyclic ethers and lactones with phenylthio migration
作者:Kelly Chibale、Stuart Warren
DOI:10.1016/s0040-4039(00)74262-6
日期:1992.7
Kinetic resolutions in Lewis acid catalysed asymmetric anti aldol reactions of the boron enolate of imide (2) with racemic 2-phenylthio aldehydes (3a) – (3c) give good yields of anti,anti aldols (7). Synthesis of homochiral cyclic ethers (4a) – (4c) and (5a) – (5c), and a simple novel route to homochiral lactones (6a) – (6c) are described.
Kinetic resolution in asymmetric anti aldol reactions of branched and straight chain racemic 2-phenylsulfanyl aldehydes: asymmetric synthesis of cyclic ethers and lactones by phenylsulfanyl migration
作者:Kelly Chibale、Stuart Warren
DOI:10.1039/p19960001935
日期:——
The kinetic resolution of branched and straight chain 2-phenylsulfanyl aldehydes by the Lewis acid-catalysed asymmetric anti aldol reaction followed by reduction to single enantiomers of 1,3-diols and/or acid-catalysed cyclisation with PhS migration provides a route to enantiomerically pure cyclic ethers and lactones with full stereochemical control.
The stereoselective synthesis of oxetanes; exploration of a new, Mitsunobu-style procedure for the cyclisation of 1,3-diols
作者:Martin Christlieb、John E. Davies、Jason Eames、Richard Hooley、Stuart Warren
DOI:10.1039/b106851b
日期:2001.11.15
A solution of 2-methyl-3-[1-(phenylsulfanyl)cyclohexyl]propane-1,3-diol 1 in toluene treated with triphenylphosphine, Ziram®
2 and DEAD, gave 3-methyl-2-[1-(phenylsulfanyl)cyclohexyl]oxetane 3 in 85% yield. A mechanistic study has been undertaken, optimal conditions have been found and the range of substrates for which the reaction is useful has been explored. We include the results of an X-ray study which shows that compound 33 (the oxidation product of diol 1) is a sulfone rather than a sulfoxide as previously reported.
The synthesis of optically active 2-phenylthio aldehydes
作者:Kelly Chibale、Stuart Warren
DOI:10.1016/s0040-4039(00)76722-0
日期:1994.6
Opticallyactive linear and branched chain 2-phenylthio aldehydes can be made in high optical purity (up to > 98% e.e.) by sulfenylation of a phenylalanine-derived oxazolidinone imide, reduction and re-oxidation with the Dess-Martin reagent even though the products enolise easily.
Chemoenzymatic Cascades for the Enantioselective Synthesis of β‐Hydroxysulfides Bearing a Stereocentre at the C−O or C−S Bond by Ketoreductases
作者:Fei Zhao、Kate Lauder、Siyu Liu、James D. Finnigan、Simon B. R. Charnock、Simon J. Charnock、Daniele Castagnolo
DOI:10.1002/anie.202202363
日期:2022.8
Four ketoreductases (KREDs) were identified for the enantioselectivesynthesis of β-hydroxysulfides. KRED311 and KRED349 catalyse the synthesis of β-hydroxysulfides bearing a stereocentre at the C−Obond with opposite absolute configurations via chemoenzymaticcascades from thiophenols/thiols and α-haloketones/alcohols. KRED253 and KRED384 catalyse the synthesis of β-hydroxysulfides bearing a stereocentre