Asymmetric Friedel–Crafts alkylation using chiral α-acyl-α-chloromethylsulphides
摘要:
Lewis acid catalysed stereoselective Friedel-Crafts alkylation of aromatic compounds with alpha-(-)-menthyl-oxycarbonyl-alpha-(phenylthio)methyl chloride and alpha-(-)-8-phenylmenthyloxycarbonyl-alpha-(phenylthio)methyl chloride is described. (C) 2000 Elsevier Science Ltd. All rights reserved.
The diastereoselective anodic fluorination of α-phenylsulfenyl esters by intramolecular asymmetry-induction has been studied using chiral auxiliaries such as phenethyl, bornyl, isobornyl, menthyl and 8-phenylmenthyl groups. Of these chiral auxiliaries, the 8-phenylmenthyl group gave the best diastereoselectivity. The diastereoselectivity was also affected by supporting electrolytes and it was found
Asymmetric aromatic vicarious nucleophilic substitution of hydrogen
作者:Mark D. Drew、David A. Jackson、Nicholas J. Lawrence、John Liddle、Robin G. Pritchard
DOI:10.1039/a606921e
日期:——
A series of novel one-pot aromatic vicarious nucleophilic substitution
of hydrogen/asymmetric alkylation reactions are described; the enolates of
several chiral cyclohexyl phenylsulfanylacetates react readily with
3-chloronitrobenzene followed by subsequent stereoselective alkylation.
Pummerer-type α-functionalization of arylseleninylacetates by treating with trimethylsilyl- or tri-n-butylstannyl-masked nucleophiles and trifluoroacetic anhydride or a Lewis acid
Arylseleninylacetates underwent facile alpha-functionalization on treatment with trimethylsilyl- or tri-n-butylstannyl-masked nucleophiles and trifluoroacetic anhydride (TFAA) or a Lewis acid. (C) 2000 Elsevier Science Ltd. All rights reserved.
SYNTHESIS OF ARYL CYCLOHEXANE ESTER DERIVATIVES USEFUL AS SENSATES IN CONSUMER PRODUCTS
申请人:The Procter & Gamble Company
公开号:US20190276389A1
公开(公告)日:2019-09-12
Personal care compositions, such as oral care and skin care compositions containing a flavor/perfume system comprising one or more coolants. The pleasant cool sensation provided by a coolant is enhanced in terms of quicker onset, greater intensity, impact or longer duration, which improves appeal and acceptability of the compositions to consumers.
Facile and efficient synthesis of chiral sulfoxide esters: Versatile tool in asymmetric synthesis
作者:Reshma Nagpal、Aman Bhalla、Jitender Bhalla、Shamsher S. Bari、Renu Thapar
DOI:10.1080/00397911.2018.1554145
日期:2019.1.17
Abstract Facile and efficient synthesis of sulfoxide esters using menthols as chiral auxiliary is described. Phenylthio/benzylthio/naphthylthioacetic esters act as an efficient substrate for chiral sulfoxides via oxidation in one step. The structural and stereochemical aspects of target product were established on the basis of various spectroscopic studies, namely FT-IR, NMR (1H NMR and 13C NMR) and