[EN] CATALYTICS ASYMMETRIC ACTIVATION OF UNACTIVATED C-H BONDS, AND COMPOUNDS RELATED THERETO [FR] ACTIVATION CATALYTIQUE ASYMETRIQUE DE LIAISONS C-H INACTIVEES ET COMPOSES ASSOCIES
Nucleophilic Acyl Substitutions of Anhydrides with Protic Nucleophiles Catalyzed by Amphoteric, Oxomolybdenum Species
摘要:
[GRAPHICS]Among six different group VIb oxometallic species examined, dioxomolybdenum dichloride and oxomolybdenum tetrachloride were the most efficient catalysts to facilitate nucleophilic acyl substitution (NAS) of anhydrides with a myriad array of alcohols, amines, and thiols in high yields and high chemoselectivity. In contrast to the well-recognized redox chemical behaviors associated with oxomolybdenum(VI) species, the catalytic NAS was unprecedented and tolerates virtually all kinds of functional groups. By using benzoic anhydride as a mediator for in situ generation of an incipient mixed anhydride -MoO2Cl2 adduct with a given functional alkanoic acid, one can achieve oleate, dipeptide, diphenylmethyl, N-Fmoc-alpha-amino, pyruvic, and tert-butylthio ester, N-tert-butylamide, and trityl methacrylate syntheses with appropriate protic nucleophiles. The amphoteric character of the Mo=O unit in oxomolybdenum chlorides was found to be responsible for the catalytic NAS profile as supported by a control NAS reaction of using an authentic adduct-MoOCl2(O-2-CBut)(2) between pivalic anhydride and MoO2Cl2 as the catalyst.
BICYCLIC HETEROCYCLE DERIVATIVES FOR THE TREATMENT OF PULMONARY ARTERIAL HYPERTENSION
申请人:Bruce Ian
公开号:US20150025059A1
公开(公告)日:2015-01-22
Bicyclic heterocyclic derivatives of formula I useful in inhibiting PDGF receptor mediated biological activity.
wherein A is
and R
1
, R
1a
, R
2
, R
3
, R
4
, R
5
, R
6
and X are as defined herein.
This disclosure provides compounds and compositions and methods of using those compounds and compositions to treat diseases and disorders associated with excessive transforming growth factor-beta (TGFβ) activity. This disclosure also provides methods of using the compounds in combination with one or more cancer immunotherapies.
This disclosure provides compounds and compositions and methods of using those compounds and compositions to treat diseases and disorders associated with excessive transforming growth factor-beta (TGFβ) activity. This disclosure also provides methods of using the compounds in combination with one or more cancer immunotherapies.
US9751876B2
申请人:——
公开号:US9751876B2
公开(公告)日:2017-09-05
[EN] CATALYTICS ASYMMETRIC ACTIVATION OF UNACTIVATED C-H BONDS, AND COMPOUNDS RELATED THERETO<br/>[FR] ACTIVATION CATALYTIQUE ASYMETRIQUE DE LIAISONS C-H INACTIVEES ET COMPOSES ASSOCIES
申请人:UNIV BRANDEIS
公开号:WO2006026053A1
公开(公告)日:2006-03-09
One aspect of the present invention is directed in part to catalytic and stereoselective functionalization of unactivated C-H bonds of simple organic substrates. The compounds and methods provided herein allow one to control the stereochemistry in a C-H activation step, activate substrates containing α-hydrogens next to the directing group, and remove a directing group under mild conditions. One aspect of the present invention relates to a transition-metal-catalyzed method for selective and asymmetric oxidation of carbons located in a β- or Ϝ-position relative to an auxiliary. Another aspect of the invention relates to the enantiomerically-enriched substrates and the enantiomerically-enriched products formed via said method. In certain embodiments, oxazoline and oxazinone directing groups are used. In addition, the Boc protecting group has been identified as a directing group which does not necessitate removal.