Asymmetric intramolecular cyclopropanation of diazo compounds with metallosalen complexes as catalyst: structural tuning of salen ligand
摘要:
Intramolecular cyclopropanation of alkenyl alpha-diazoacetates and alkenyl diazomethyl ketones was examined by using optically active (ON+)Ru(11)(salen) and Co(II)(salen) complexes as catalysts. For the cyclization of 2-alkenyl alpha-diazoacetates, Co(II)(salen) complexes 9 and 10 were found to be superior catalysts to the corresponding (ON+)Ru(11)(salen) complexes 4 and 5. On the other hand, (ON+)Ru(II)(salen) complex 2 was found to be the catalyst of choice for the cyclization of 3-alkenyl diazomethyl ketones, and complex 4 was found to be a good catalyst for the cyclization of (E)-4-alkenyl diazomethyl ketones. The present study demonstrates that metallosalen complexes, especially optically active (ON+)Ru(II)(salen) and Co(11)(salen) complexes, can serve as efficient catalysts for the cyclization of alkenyl diazocarbonyl compounds, if a suitable salen ligand is used as the chiral auxiliary. (C) 2003 Elsevier Science Ltd. All rights reserved.
A stereoselective synthesis of (E)-1-halo-6,6-dimethyl-2-hepten-4-yne: a key intermediate for terbinafine
作者:Shan-Yen Chou、Chin-Lu Tseng、Shyh-Fong Chen
DOI:10.1016/s0040-4039(00)00511-6
日期:2000.5
A study of the stereoselective halogenation of 6,6-dimethyl-1-hepten-4-yn-3-ol (1) using a series of halogenating agents is described. Of the many agents investigated, boron trichloride is the most successful reagent for stereoselective halogenation (E:Z=9:1max). The resulting (E)-1-halo-6,6-dimethyl-2-hepten-4-yne (2), a keyintermediate for terbinafine, an antifungal agent, is obtained in good yield
A highly practical approach to chiral homoallylic–homopropargylic amines via aza-Barbier reaction
作者:Bin-Hua Yuan、Zhi-Cheng Zhang、Wen-Jie Liu、Xing-Wen Sun
DOI:10.1016/j.tetlet.2016.03.103
日期:2016.5
The first access to chiral homoallylic–homopropargylic amine bearing two contiguous stereocenters has been well accomplished via zinc-promoted aza-Barbier reaction. N-tert-Butanesulfinyl ketimines are well-tolerated substrates, providing the tertiary amines in high yields and with excellent diastereoselectivities. 3,4-Dihydro-2H-pyrroles could be prepared in high efficiency by cyclization of the corresponding
Combination therapy using a dual PPAR-a/PPAR-y activator and a GLP-1 derivative for the treatment of metabolic syndrome and related diseases and disorders
申请人:——
公开号:US20030199451A1
公开(公告)日:2003-10-23
The present invention relates to a pharmaceutical composition comprising a dual Peroxisome Proliferator-Activated Receptor-alpha/Peroxisome Proliferator-Activated Receptor-gama activator (PPAR-&agr;/PPAR-&ggr;) and a Glucagon Like Peptide-1 (GLP-1) derivative for treating, preventing and reducing the risk of developing Type 2 diabetes, insulin resistance, dyslipidemia, obesity, hypertension and other related diseases and disorders.
Alkynyl-substituted propionic acid derivatives, their preparation and use
申请人:Novo Nordisk A/S
公开号:US06569901B2
公开(公告)日:2003-05-27
The present invention relates to compounds of formula (I)
The compounds are useful in the treatment and/or prevention of conditions mediated by nuclear receptors, in particular the Peroxisome Proliferator-Activated Receptors (PPAR).
Combination therapy using a dual PPAR-α/PPAR-γ activator and a GLP-1 derivative for the treatment of metabolic syndrome and related diseases and disorders
申请人:Novo Nordisk A/S
公开号:US07202213B2
公开(公告)日:2007-04-10
The present invention relates to a pharmaceutical composition comprising a dual Peroxisome Proliferator-Activated Receptor-alpha/Peroxisome Proliferator-Activated Receptor-gama activator (PPAR-α/PPAR-γ) and a Glucagon Like Peptide-1 (GLP-1) derivative for treating, preventing and reducing the risk of developing Type 2 diabetes, insulin resistance, dyslipidemia, obesity, hypertension and other related diseases and disorders.