Ring opening reaction of epoxides with diphenyl phosphorazidate
摘要:
Diphenyl phosphorazidate with 4-dimethylaminopyridine and lithium perchlorate opens epoxides regio- and stereoselectively to give O-diphenylphosphoryl vicinal azidohydrins. For the alpha,beta-epoxy ketones and esters, only the corresponding alpha-azidovinyl ketones and esters were directly obtained, respectively. (C) 1999 Elsevier Science Ltd. All rights reserved.
An Improved Procedure for the Conversion of Alkenes and Glycals to 1,2-Diazides Using Mn(OAc)<sub>3</sub>·2H<sub>2</sub>O in Acetonitrile Containing Trifluoroacetic Acid
作者:Barry B. Snider*、Hong Lin
DOI:10.1080/00397919808007024
日期:1998.5
Abstract Alkenes and Glycals react with Mn(OAc3)·2H2O and NaN3 in 9:1 acetonitrile-trifluoroacetic acid to give 1,2-diazides in >80% yield. Allylic azides are formed by slow addition of NaN3 to a mixture of alkene, Mn(OAc)3·2H2O and Cu(OAc)2.
Vinyliminophosphorane-mediated preparation of 2-arylquinoline and 4-aryl-1-azaanthraquinone derivatives. X-Ray crystal structure of 1,2-dihydro-3H-indazolo[2,3-a]quinolin-4-one
The reaction of the iminophosphorane derived from 3-azidocyclohexen-2-enone with substituted cinnamyl aldehydes affords 2-aryl-tetrahydroquinoline derivatives, which are easily converted into 2-arylquinolines. By contrast, iminophosphorane derived from 2-azidocyclohex-2-enone reacts only with α,β-unsaturated aldehydes without substituent at β-position to give 5,6-dihydro-8(7H)quinolinones. The iminophosphorane
衍生自3-叠氮基环己烯-2-烯酮的亚氨基膦烷与取代的肉桂醛的反应提供了2-芳基-四氢喹啉衍生物,其易于转化为2-芳基喹啉。相比之下,衍生自2-叠氮基环己-2-烯酮的亚氨基磷烷仅与α,β-不饱和醛反应,在β-位没有取代基,得到5,6-二氢-8(7H)喹啉酮。衍生自2-叠氮基-1,4-萘醌的亚氨基磷烷与取代的肉桂醛反应,直接提供4-芳基-1-氮杂蒽醌。通过X射线分析已解决了1,2-二氢-3 H-吲唑并[2,3 - a ]喹啉-4-酮的晶体和分子结构。
IMIDIAZOLE DERIVATIVES AND THEIR USE AS AGONISTS SELECTIVE AT ALPHA 2B OR 2B/2C ADRENERGIC RECEPTORS