软铜基硅亲核试剂的 C4 选择性加成到三氟甲磺酸吡啶鎓中,使其能够以高产率和优异的对映选择性进行对映选择性去芳构化(参见方案;( R , R )-Ph-BPE=1,2-bis[(2 R , 5R )-2,5-二苯基磷杂环己烷-1-基]乙烷)。由此形成的α-手性甲硅烷基单元可以进一步用于控制后续转化中的立体选择性。
[EN] PROCESS FOR THE CATALYTIC DIRECTED CLEAVAGE OF AMIDE-CONTAINING COMPOUNDS<br/>[FR] PROCÉDÉ POUR LE CLIVAGE CATALYTIQUE DIRIGÉ DE COMPOSÉS CONTENANT UN AMIDE
申请人:UNIV ANTWERPEN
公开号:WO2017046133A1
公开(公告)日:2017-03-23
The present invention relates to a catalytic method for the conversion of amide-containing compouds by means of a build-in directing group and upon the action of a heteronucleophilic compound (in se an amine (RNH2 or RNHR') or an alcohol (ROH) or a thiol (RSH)) in the presence of a metal catalyst to respectively esters, thioesters, carbonates, thiocarbonates and to what is defined as amide-containing compounds (such as carboxamides, urea, carbamates, thiocarbamates). The present invention also relates to these amide-containing compounds having a build-in directing group (DG), as well as the use of such directing groups in the catalytic directed cleavage of N-DG amides with the use of heteronucleophiles (in se an amine (RNH2 or RNHR') or an alcohol (ROH) or thiol (RSH)).
The present invention relates to extracts of
Isochrysis
sp., preferably Tahitian
Isochrysis,
its cosmetic, dermatological and/or therapeutic uses and compositions and cosmetic, dermatological or therapeutic products comprising such an extract of
Isochrysis
sp., preferably Tahitian
Isochrysis.
Free-radical anti-Markovnikov hydroalkylation of unactivated alkenes with simple alkanes
作者:Yunfei Tian、Anbo Ling、Ren Fang、Ren Xiang Tan、Zhong-Quan Liu
DOI:10.1039/c8gc01394b
日期:——
A Cu(II)-mediated radical anti-Markovnikov hydroalkylation of unactivated alkenes with simple alkanes via selective C(sp3)–Hbond cleavage was achieved. This reaction features high site-selectivity diverse functional group tolerance, and scalability.
PROCESS FOR THE PREPARATION OF UNSATURATED TRIFLUOROMETHANESULFONATE STEROID DERIVATIVES
申请人:OLON S.P.A.
公开号:US20150337007A1
公开(公告)日:2015-11-26
Disclosed is a method for the conversion of a compound of formula 3 to a compound
of formula 4, wherein R is an acetyl group or an alcohol-protecting group. The process involves reacting 3 with a triflating agent in the presence of a nicotinate (3-pyridinecarboxylate) of a C1-C4 alcohol, preferably methyl nicotinate (methyl 3-pyridinecarboxylate) or ethyl nicotinate (ethyl 3-pyridinecarboxylate), to give 4. The method can be conveniently used in a process for the preparation of Abiraterone or Abiraterone acetate.
USE OF DIHYDRODEHYDRODIISOEUGENOL AND PREPARATIONS COMPRISING DIHYDRODEHYDRODIISOEUGENOL
申请人:Meyer Imke
公开号:US20130101650A1
公开(公告)日:2013-04-25
This invention relates to cosmetic and pharmaceutical preparations comprising
(i) a diastereomer or a mixture of two or more diastereomers of the compound of formula (I)
or
(ii) a salt of a diastereomer or of a mixture of two or more diastereomers of the compound of formula (I) or
(iii) a mixture of two or more salts of a diastereomer or of a mixture of two or more diastereomers of the compound of formula (I),
a diastereomer, salt or a mixture as defined above as a drug for topical application and/or for the treatment of lipoatrophy;
the non-therapeutic use of a diastereomer, salt or a mixture as defined above for the prevention, treatment or reduction of skin aging, especially skin wrinkles;
the use of a diastereomer, salt or a mixture as defined above for the production of an orally administered non-pharmaceutical preparation.