Amino acid amides of 2-[(2-aminobenzyl)sulfinyl]benzimidazole as acid-stable prodrugs of potential inhibitors of H+K+ ATPase
摘要:
A series of amino acid amides of 2-[(2-aminobenzyl)sulfinyl]benzimidazole were prepared and found to possess gastric antisecretory activity on oral administration. (Glycylaminobenzyl)sulfinyl compound 23a, stable in artificial gastric juice (pH 1.2), was given orally to dogs. It was absorbed efficiently and converted into aniline derivative 7a which showed a very high plasma concentration. Compound 23a was hydrolyzed by the action of aminopeptidase present in plasma or the brush border fraction of the small intestine to release the terminal glycine. omicron-Aniline derivatives showed good activity in in vitro H+/K+-ATPase inhibition as well as in the inhibition of histamine stimulated acid secretion in isolated bullfrog gastric mucosa. Although these omicron-aniline derivatives showed no or weak gastric antisecretory activity in rat by id administration, they were active when administered ip. Therefore, these amino acid amides were considered to be acid stable prodrugs of proton pump inhibiting omicron-aniline derivatives. The mechanism of H+/K+-ATPase inhibition of 7a was also examined.
A Practical in situ Generation of the Schwartz Reagent. Reduction of Tertiary Amides to Aldehydes and Hydrozirconation
作者:Yigang Zhao、Victor Snieckus
DOI:10.1021/ol403183a
日期:2014.1.17
A new, highly efficient in situ protocol (Cp2ZrCl2/LiAlH(OBu-t)3) is described for the generation of the Schwartz reagent which provides a convenient method for the amide to aldehyde reduction and the regioselective hydrozirconation–iodination of alkynes and alkenes. Highlighted are chemoselective reductions of benzamides derived by directedorthometalation (DoM) chemistry, allowing the synthesis
描述了一种新的高效原位实验方案(Cp 2 ZrCl 2 / LiAlH(OBu- t)3),用于产生Schwartz试剂,该试剂为酰胺到醛的还原以及炔烃的区域选择性加氢锆化加碘提供了便利的方法。和烯烃。突出显示的是通过定向邻位金属化(D o M)化学反应生成的苯甲酰胺的化学选择性还原,可合成有价值的1,2,3-取代的苯甲醛。单步三组分过程在非常短的反应时间内进行,显示出极好的官能团相容性,并使用廉价且长期保存的稳定还原剂。
Green, Palladium-Catalyzed Synthesis of Benzylic<i>H</i>-Phosphinates from Hypophosphorous Acid and Benzylic Alcohols
作者:Laëtitia Coudray、Jean-Luc Montchamp
DOI:10.1002/ejoc.200800581
日期:2008.8
Benzylicalcohols cross-couple directly with concentrated H(3)PO(2) using Pd/xantphos (1 or 2 mol-%). Depending on the substrate, DMF at 110 degrees C, or t-AmOH at reflux with a Dean-Stark trap, can be used. A broad range of benzylicalcohols reacted successfully in moderate to good yields. The preparation of other organophosphorus compounds (phosphinic and phosphonic acids) is also demonstrated.Asymmetric