Protecting group-free use of alcohols as carbon electrophiles in atom efficient aluminium triflate-catalysed dehydrative nucleophilic displacement reactions
作者:Adam Cullen、Alfred J. Muller、D. Bradley G. Williams
DOI:10.1039/c7ra08784e
日期:——
Benzylic and allylic alcohols are rendered electrophilic without chemical modification by the use of aluminium triflate as catalyst. The reaction succeeds with alcohol, thiol, carbon and nitrogen nucleophiles. When phenols are employed as nucleophiles, C-alkylation ensues. An advanced application of the method is demonstrated in the synthesis of 2H-chromenes and their N and S analogues.
Nickel-Catalyzed Cross-Coupling of Chromene Acetals and Boronic Acids
作者:Thomas J. A. Graham、Abigail G. Doyle
DOI:10.1021/ol300364s
日期:2012.3.16
nes is described. Under base-free conditions, readily accessible 2-ethoxy-2H-chromenes undergo Csp3–O activation and Csp3–C bond formation in the presence of an inexpensive nickel catalyst and boronicacids. This new strategy enables broad access to 2-substituted-2H-chromenes and has been applied to the late-stage incorporation of complex molecules, including the pharmaceuticals loratidine and indomethacin
描述了一种用于合成 2-芳基-和杂芳基-2 H-色烯的模块化和高效方案。在无碱条件下,容易获得的 2-乙氧基-2 H-色烯在廉价的镍催化剂和硼酸存在下经历 C sp 3 -O 活化和 C sp 3 -C 键形成。这种新策略可以广泛使用 2-取代-2 H-色烯,并已应用于复杂分子的后期掺入,包括药物氯雷他定和吲哚美辛甲酯。
Catalytic Enantioselective Synthesis of 2-Aryl Chromenes and Related Phosphoramidite Ligands and Catalyst Compounds
申请人:Northwestern University
公开号:US20150315168A1
公开(公告)日:2015-11-05
Methods to access 2-aryl chromene compounds via an asymmetric catalytic process.
通过不对称催化过程访问2-芳基色素化合物的方法。
Transition-Metal-Free Cross-Coupling of Indium Organometallics with Chromene and Isochroman Acetals Mediated by BF<sub>3</sub>·OEt<sub>2</sub>
作者:José M. Gil-Negrete、José Pérez Sestelo、Luis A. Sarandeses
DOI:10.1021/acs.orglett.6b02058
日期:2016.9.2
coupling of triorganoindiumreagents with benzopyranyl acetals mediated by a Lewis acid has been developed. The reaction of R3In with chromene and isochroman acetals in the presence of BF3·OEt2 afforded 2-substituted chromenes and 1-substituted isochromans, respectively, in good yields. The reactions proceed with a variety of triorganoindiumreagents (aryl, heteroaryl, alkynyl, alkenyl, alkyl) using
CHROMENE MODULATORS OF CHEMOKINE RECEPTOR ACTIVITY
申请人:Bristol-Myers Squibb Company
公开号:US20140235672A1
公开(公告)日:2014-08-21
The present application describes modulators of MCP-1 or CCR-2 of formula
or stereoisomers or prodrugs or pharmaceutically acceptable salts thereof, wherein W
1
, W
2
, W
3
, Y, Z, R
2
, R
3
, R
3′
and R
4
, are defined in the specification. In addition, methods of treating and preventing inflammatory diseases such as asthma and allergic diseases, as well as autoimmune pathologies such as rheumatoid arthritis and transplant rejection using modulators of formula (I) are disclosed.