Synthesis of non-symmetric bisoxazoline compounds. An easy way to reach tailored chiral ligands
摘要:
Bisoxazoline compounds have been used as chiral catalyst ligands in a wide variety of reactions. A great deal of effort has been aimed at the synthesis of C-2-symmetric bisoxazolines but very few references exist for non-symmetric ones. As part of our studies into the possible usefulness of non-symmetric bisoxazolines, we report an easy method for the synthesis of bisoxazoline compounds bearing different substituents in each oxazoline ring. (c) 2006 Elsevier Ltd. All rights reserved.
The products of the condensation reactions of twenty-six different 1,2-amino alcohols with excess aqueous formaldehyde were identified, with the help of a simple and effective analytical technique based on mass spectroscopy. With a few exceptions, which arise from steric or solubility effects, most amino alcohols form bis(oxazolidine)methane adducts preferentially.
Asymmetric Synthesis of Protected 1,2-Amino Alcohols Using <i>tert</i>-Butanesulfinyl Aldimines and Ketimines
作者:Tony P. Tang、Steven K. Volkman、Jonathan A. Ellman
DOI:10.1021/jo0156868
日期:2001.12.1
tert-Butanesulfinyl aldimines and ketimines bearing an alpha-benzyloxy or alpha-silyloxy substituent serve as precursors in the synthesis of protected 1,2-amino alcohols in high yields and diastereoselectivities. General protocols are described for the addition of unbranched alkyl, branched alkyl, and aryl organometallic reagents to N-sulfinyl aldimines 1 and 2 and ketimines 5 and 6. Furthermore, the
Discovery of pyrido[2,3-d]pyrimidine-based inhibitors of HCV NS5A
作者:David A. DeGoey、David A. Betebenner、David J. Grampovnik、Dachun Liu、John K. Pratt、Michael D. Tufano、Wenping He、Preethi Krishnan、Tami J. Pilot-Matias、Kennan C. Marsh、Akhteruzzaman Molla、Dale J. Kempf、Clarence J. Maring
DOI:10.1016/j.bmcl.2013.04.009
日期:2013.6
Efforts to improve the genotype 1a potency and pharmacokinetics of earlier naphthyridine-based HCVNS5Ainhibitors resulted in the discovery of a novel series of pyrido[2,3-d]pyrimidine compounds, which displayed potent inhibition of HCVgenotypes 1a and 1b in the replicon assay. SAR in this system revealed that the introduction of amides bearing an additional ‘E’ ring provided compounds with improved
努力提高早期基于萘啶的 HCV NS5A 抑制剂的基因型1a效力和药代动力学导致发现了一系列新的吡啶并[2,3- d ]嘧啶化合物,它们在复制子中显示出对 HCV 基因型 1a 和 1b 的有效抑制作用化验。该系统中的 SAR 表明,引入带有额外“E”环的酰胺为化合物提供了改进的效力和药代动力学。在酰胺部分引入手性中心导致观察到复制子效力的立体化学依赖性,并为连接可用于提高系列溶解度的官能团提供位点。化合物21被选择用于在感染HCV的黑猩猩中给药。对病毒载量大幅下降的观察为化合物系列在体内抑制 HCV 复制提供了积极的概念证明。
An Efficient and General One-Pot Method for the Synthesis of Chiral Bis(oxazoline) and Pyridine Bis(oxazoline) Ligands
作者:J. I. García、E. Pires、A. Cornejo、J. M. Fraile、M. J. Gil、V. Martínez-Merino、J. A. Mayoral、I. Villalba
DOI:10.1055/s-2005-872672
日期:——
expeditious method for the synthesis of chiral boxand pybox ligands is reported. The approach is based on a one-potcondensation reaction of chiral b-amino alcohols with a dinitrileusing stoichiometric or catalytic amounts of zinc triflate. Yieldsgreater than 90% are obtained in many cases without the need forfurther purification of the product. Key words: bis(oxazolines), pybox, synthesis, zinc triflate, tolu-ene
[Problem]
A pharmaceutical composition for treating or preventing various cardiovascular diseases, which have sGC activities based on improvement of cGMP signals, is provided.
[Means for Solution]
It was found that imidazo[1,2-a]pyridine compounds having a carbamoyl group at the 3-position and a particular cyclic group at the 8-position via a methyleneoxy group, or a salt thereof have sGC activation, and are useful as active ingredients of pharmaceutical compositions for treating or preventing various sGC-related cardiovascular diseases, in particular, peripheral arterial diseases, intermittent claudication, critical limb ischemia, hypertension, and pulmonary hypertension, thereby completing the present invention.