Catalytic asymmetric construction of morpholines and piperazines by palladium-catalyzed tandem allylic substitution reactions
摘要:
Reaction of 1,4-diacetoxy-cis-2-butene (1a) with 2-(benzylamino)ethanol (2a) was catalyzed by a palladium complex (5 mol %) coordinated with (R)-2,2'-bis(diphenylphosphino)-1,1'-binaphthyl to give optically active (R)-4-benzyl-2-vinylmorpholine (3a) of up to 65% ee. Optically active 1,4-bis(p-tolylsulfonyl)-2-vinylpiperazine (7a) (60% ee) was also obtained from 1,4-dicarbomethoxy-2-butene (1b) and 1,2-bis[(p-tolylsulfonyl)amino]ethane (6a) in a similar manner. This cyclization proceeds through a tandem allylic substitution via pi-allylpalladium intermediates. The palladium-catalyzed reaction with 2-amino-1,3-propanediols 17 gave 2-vinyl-5-(hydroxymethyl)morpholines of up to 73 % ee.
Rolling Up the Sheet: Constructing Metal–Organic Lamellae and Nanotubes from a [{Mn<sub>3</sub>(propanediolato)<sub>2</sub>}(dicyanamide)<sub>2</sub>]<sub><i>n</i></sub> Honeycomb Skeleton
作者:Gang Wu、Jiaquan Bai、Yuan Jiang、Guanghua Li、Jian Huang、Yi Li、Christopher E. Anson、Annie K. Powell、Shilun Qiu
DOI:10.1021/ja409569q
日期:2013.12.11
Target synthesis of metal-organic nanotubes (MONTs) through a classic "rolling-up" mechanism remains a big challenge for coordination chemists. In this work, we report three 2D lamellar compounds and one (4,0) zigzag MONT based on a common honeycomb coordination skeleton. Our synthetic strategy toward sheet/tube superstructure transformation is to asymmetrically modify the inter-layer interactions
Compounds of the present invention, and pharmaceutically acceptable compositions thereof, are useful as modulators of ATP-Binding Cassette (“ABC”) transporters or fragments thereof, including Cystic Fibrosis Transmembrane Conductance Regulator (“CFTR”). The present invention also relates to methods of treating ABC transporter mediated diseases using compounds of the present invention.
Compounds of the present invention, and pharmaceutically acceptable compositions thereof, are useful as modulators of ATP-Binding Cassette (“ABC”) transporters or fragments thereof, including Cystic Fibrosis Transmembrane Conductance Regulator (“CFTR”). The present invention also relates to methods of treating ABC transporter mediated diseases using compounds of the present invention.
Compounds of the present invention, and pharmaceutically acceptable compositions thereof, are useful as modulators of ATP-Binding Cassette (“ABC”) transporters or fragments thereof, including Cystic Fibrosis Transmembrane Conductance Regulator (“CFTR”). The present invention also relates to methods of treating ABC transporter mediated diseases using compounds of the present invention.
Compounds of the present invention, and pharmaceutically acceptable compositions thereof, are useful as modulators of ATP-Binding Cassette (“ABC”) transporters or fragments thereof, including Cystic Fibrosis Transmembrane Conductance Regulator (“CFTR”). The present invention also relates to methods of treating ABC transporter mediated diseases using compounds of the present invention.