7 .alpha.-formamido cephalosporin derivatives having a 3[N-(optionally substituted)aminothiopyridinium thiomethyl] substituent have anti-bacterial activity and are of use in anti-bacterial therapy. Processes for the preparation thereof and intermediates for use in these processes are also disclosed.
This invention relates to certain novel benzoxazinone compounds and derivatives thereof, their synthesis, and their use as oxytocin receptor antagonists. One application of these compounds is in the treatment of preterm labor. The ability of the compounds to relax uterine contractions in mammals also makes them useful for treating dysmenorrhea and stopping labor prior to cesarean delivery. A typical compound is as follows: ##STR1##
Synthesis of highly substituted 2-spiropiperidines
作者:Samuel D. Griggs、Nathan Thompson、Daniel T. Tape、Marie Fabre、Paul A. Clarke
DOI:10.1039/c8ob01272e
日期:——
2-Spiropiperidines are a highly desirable, yet under represented structure in drug discovery. 2-Spiropiperidines were synthesised in either a two-pot or one-pot reaction. In the two-pot reaction, the addition of a Weiler dianion to N-Boc imines, followed by deprotection and in situ condensation with a cyclic ketone generated functionalised 2-spiropiperidines in good to excellent yields. In the one-pot
Asymmetric Michael addition of 4H-thiopyran-4-one to nitroolefins catalyzed by diamine mono-N-sulfonamide and its application to concise synthesis of enantiopure multiring heterocycles
作者:Lei Mo、Huang Tang、Zhu-Jun Yao
DOI:10.1016/j.tet.2013.05.116
日期:2013.8
and diastereoselective Michaeladdition of 4H-thiopyran-4-one to a variety of nitroolefins. Catalyst 10 was identified in the examinations to exhibit more superior catalytic ability than the traditional chiral pyrrolidine catalysts, giving high chemical yields, excellent diastereo- and enantioselectivities (up to 99:1 dr and 98% ee). The tert-butyl sulfonamide functionality of catalyst 10 is speculated
已经设计,合成了一系列新的C 2对称的2'-联吡咯烷单-N-磺酰胺,并将其成功地用作有机催化剂,用于将4 H -thiopyran-4-one对映体和非对映体选择性迈克尔加成。硝基烯烃。在检查中鉴定出的催化剂10具有比传统的手性吡咯烷催化剂更高的催化能力,具有较高的化学收率,出色的非对映体和对映体选择性(高达99:1 dr和98%ee)。催化剂10的叔丁基磺酰胺官能度推测在过渡态中作为庞大的基团和氢键受体都起着至关重要的作用。还研究了代表性的迈克尔加合物的应用,并证明其对于通过独特的常见双环硝酮中间体的对映纯多环杂环的面向多样性的合成是有用的。
An esr investigation on group IVb organometalloxy- and organometalthio-pyryl and thiapyryl radicals
作者:Angelo Alberti、Francesco Paolo Colonna、Gian Franco Pedulli
DOI:10.1016/0040-4020(80)88030-6
日期:1980.1
triphenylgermyl and triphenylstannyl radicals with γ-pyrone, γ-thiopyrone, thia-γ-pyrone and thia-γ-thiopyrone have been studied by ESR spectroscopy. The spectral parameters indicate that these radicals adopt the conformation where the O-M or S-M bonds are eclipsed with the 2 pz orbital of the γ-carbon, despite the absence of hindering substituent groups in proximity of the radical centre.
通过ESR光谱研究了三苯基甲硅烷基,三苯基锗基和三苯基锡烷基与γ-吡喃酮,γ-硫代吡喃酮,硫代-γ-吡喃酮和硫代-γ-硫代吡喃酮的自旋加合物。光谱参数表明,尽管自由基中心附近不存在阻碍取代基的基团,但这些自由基采用的构型是OM或SM键被γ-碳的2 p z轨道所遮盖。