The Chiral Auxiliary <i>N</i>-1-(1′-Naphthyl)ethyl-<i>O</i>-<i>tert</i>-butylhydroxylamine: A Chiral Weinreb Amide Equivalent
作者:Alexander N. Chernega、Stephen G. Davies、Christopher J. Goodwin、David Hepworth、Wataru Kurosawa、Paul M. Roberts、James E. Thomson
DOI:10.1021/ol901174t
日期:2009.8.6
The chiral auxiliary N-1-(1'-naphthyl)ethyl-O-tert-butylhydroxylamine is readily prepared from N-hydroxyphthalimide in four steps, with resolution giving access to both enantiomers in >98% ee, on a multigram (>25 g) scale. Conversion to a range of N-acyl derivatives, followed by highly diastereoselective alkylation (>= 94% de) gives the corresponding chiral, 2-substituted derivatives as single diastereoisomers (>98% de) after chromatography. Reductive cleavage with LlAlH(4) allows direct access to chiral aldehydes, and treatment with MeLi gives chiral methyl ketones in excellent enantiopurity (>= 94% ee). The auxiliary can be recovered in >98% ee and recycled.
PHRAGMALIN LIMONOIDS FOR THE TREATMENT OF SEXUAL DYSFUNCTION
申请人:Dicot AB
公开号:EP2807170B1
公开(公告)日:2019-03-13
PHRAGAMALIN LIMONOIDS FOR THE TREATMENT OF SEXUAL DYSFUNCTION
申请人:DICOTYLEDON AB
公开号:US20150011616A1
公开(公告)日:2015-01-08
The present invention relates to novel chemical compounds, to methods for synthesis of such compounds, and to the use of these novel compounds in the synthesis of other chemical compounds that, inter alia, may be used in the treatment of sexual dysfunction, and for eliciting enhancing effects on sexual behavior. The invention also relates to remarkable biological properties of the novel compounds in their capacity of inducing aggressive behavior.
US9403841B2
申请人:——
公开号:US9403841B2
公开(公告)日:2016-08-02
On the Origins of Diastereoselectivity in the Alkylation of Enolates Derived from <i>N</i>-1-(1′-Naphthyl)ethyl-<i>O</i>-<i>tert</i>-butylhydroxamates: Chiral Weinreb Amide Equivalents
作者:Stephen G. Davies、Christopher J. Goodwin、David Hepworth、Paul M. Roberts、James E. Thomson
DOI:10.1021/jo902499s
日期:2010.2.19
The stereochemical outcome observed upon alkylation of enolates derived from N-1-(1′-naphthyl)ethyl-O-tert-butylhydroxamates (chiral Weinreb amide equivalents) may be rationalized by a chiral relay mechanism. Deprotonation with KHMDS leads to a nonchelated (Z)-enolate in which the oxygen atoms adopt an anti-periplanar conformation. The configuration of the N-1-(1′-naphthyl)ethyl group dictates the