Synthesis of imidazo[1,5-a]diazepine-3-carboxylates
申请人:Hoffmann-La Roche Inc.
公开号:US04118386A1
公开(公告)日:1978-10-03
A process to produce diazepine-3-carboxylates of the formula ##STR1## is selected from the group consisting of ##STR2## R.sub.6 is selected from the group consisting of hydrogen, halogen, nitro, cyano, trifluoromethyl, lower alkyl, and lower alkanoyl; R.sub.4 is lower alkyl; R.sub.3 is selected from the group consisting of phenyl, mono-substituted phenyl, disubstituted phenyl, pyridyl and mono-substituted pyridyl; and R.sub.2 is hydrogen or lower alkyl which comprises reacting a compound of the formula ##STR3## wherein R.sub.1 is of the formula ##STR4## AND R.sub.5 is lower alkyl with a compound of the formula N.dbd.C-CH.sub.2 --COOR.sub.4 in the presence of a base sufficiently strong to generate the anion of the isocyanoacetate.
作者:Frank Watjen、Raymond Baker、Mogens Engelstoff、Richard Herbert、Angus MacLeod、Anthony Knight、Kevin Merchant、Jonathan Moseley、John Saunders、Christopher J. Swain、Erik Wong、James P. Springer
DOI:10.1021/jm00130a010
日期:1989.10.1
The synthesis and biochemical evaluation of a series of oxadiazole derivatives of imidazobenzodiazepines related to the benzodiazepineantagonist Ro 15-1788 (2a) are reported. Although the oxadiazole ring is seen as an isosteric replacement for the ester linkage, significant differences in structure-activity trends were observed. Specifically, oxadiazoles 9-12 invariably had increased receptor efficacy