Type 2 Ring-Opening Reactions of Cyclopropanated 7-Oxabenzonorbornadienes with Carboxylic Acid Nucleophiles
作者:William Tam、Emily Carlson、Daniel Hong
DOI:10.1055/s-0035-1560565
日期:——
the structure of the acid catalyst or carboxylic acid nucleophile, reactionrates showed a marked dependence on acidity of these species. Ring-opening was well tolerated by functionalized substrates, with substitution on the bridgehead or aromatic portions of the molecule. The present work is the second account of this type of reaction, and provides a new route to 2-naphthylmethyl esters. The transformations
Ester derivatives and pharmaceutical compositions containing them
申请人:ZENECA LIMITED
公开号:EP0581464A1
公开(公告)日:1994-02-02
The invention concerns ester derivatives of the formula I
wherein Ar is phenyl, naphthyl, indenyl, indanyl, a 10-membered bicyclic heterocyclic moiety containing one or two nitrogen heteroatoms and optionally containing a further heteroatom selected from nitrogen, oxygen and sulphur, or a 9-membered or 10-membered bicyclic heterocyclic moiety containing one heteroatom group selected from oxygen, sulphur, sulphinyl, sulphonyl and imino;
A1 is a direct link to the oxygen atom of the ester group or A1 is (1-3C)alkylene ;
each of R4 and R5 is hydrogen or (1-4C)alkyl;
R1 is (1-4C)alkyl, (3-4C)alkenyl or (3-4C)alkynyl ; and
R2 and R3 together form a group of the formula -A2-X-A3- wherein each of A2 and A3 is independently (1-3C)alkylene and X is oxy, thio, sulphinyl, sulphonyl or imino;
or pharmaceutically-acceptable salts thereof ;
processes for their manufacture; pharmaceutical compositions containing them and their use as 5-lipoxygenase inhibitors.
Copper-Catalyzed Enantioselective Arylation via Radical-Mediated C–C Bond Cleavage: Synthesis of Chiral ω,ω-Diaryl Alkyl Nitriles
作者:Guo-Qing Cui、Jing-Cheng Dai、Yan Li、Yuan-Bo Li、Duo-Duo Hu、Kang-Jie Bian、Jie Sheng、Xi-Sheng Wang
DOI:10.1021/acs.orglett.1c02725
日期:2021.10.1
The first example of copper-catalyzed ring-opening, enantioselective arylation of cyclic ketoxime esters to access ω,ω-diaryl alkyl nitriles has been developed in high yield (up to 92% yield) with excellent enantioselectivity (up to 91% ee). Side-arm bis(oxazoline) ligand plays a significant role in this asymmetric catalytic transformation, which provides an efficient route to construct diverse chiral