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.