Copper-mediated 1,4-Conjugate Addition of Boronic Acids and Indoles to Vinylidenebisphosphonate leading to<i>gem</i>-Bisphosphonates as Potential Antiresorption Bone Drugs
wide range of gem‐bisphosphonate tetraethyl esters as precursors for bisphosphonic acids, which are potent inhibitors of bone resorption, bearing alkyl, aryl, and indole substituents in the β position were prepared through the CuII‐catalyzed 1,4‐conjugate addition of boronicacids and indoles to vinylidenebisphosphonate tetraethyl ester.
Pd-catalyzed asymmetric Suzuki–Miyaura coupling reactions for the synthesis of chiral biaryl compounds with a large steric substituent at the 2-position
Pd-catalyzed asymmetric Suzuki–Miyauracouplings of 3-methyl-2-bromophenylamides, 3-methyl-2-bromo-1-nitrobenzene and 1-naphthaleneboronic acids have been successfully developed and the corresponding axially chiral biaryl compounds were obtained in very high yields (up to 99%) with good enantioselectivities (up to 88% ee) under mild conditions. The chiral-bridged biphenyl monophosphine ligands developed
Development of Axially Chiral Styrene-Type Carboxylic Acid Ligands via Palladium-Catalyzed Asymmetric C–H Alkynylation
作者:Chi Yang、Fei Li、Tian-Rui Wu、Ru Cui、Bing-Bing Wu、Ruo-Xing Jin、Yan Li、Xi-Sheng Wang
DOI:10.1021/acs.orglett.1c02692
日期:2021.11.5
coordinated carboxylate-directed palladium-catalyzed atroposelective C–Halkynylation method for the development of novel axially chiral styrene-type carboxylic acids is disclosed. This transformation exhibits good yields (up to 85%), excellent enantiocontrol (up to 99% ee), and mild conditions. Notably, the synthetic utility of the resulting alkynyl carboxylic acid derivatives was demonstrated by various
2-aminopyridines containing fused ring substituents
申请人:——
公开号:US20010049379A1
公开(公告)日:2001-12-06
The present invention relates to 2-aminopyridine derivatives of the formula
1
wherein G, R
1
and R
2
are defined as in the specification, that exhibit activity as nitric oxide synthase (NOS) inhibitors, to pharmaceutical compositions containing them and to their use in the treatment and prevention of central nervous system and other disorders.