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.
选取一种生产式为##STR1##的二氮杂环己酸酯的方法,所述方法选自下列组合之一:##STR2##其中R.sub.6选自氢、卤素、硝基、氰基、三氟甲基、低烷基和低烷酰基;R.sub.4为低烷基;R.sub.3选自苯基、单取代苯基、双取代苯基、吡啶基和单取代吡啶基;R.sub.2为氢或低烷基,包括以下步骤:将式为##STR3##的化合物(其中R.sub.1为式##STR4##,R.sub.5为低烷基)与式为N.dbd.C-CH.sub.2 --COOR.sub.4的化合物在足够强的碱存在下反应,以生成异氰乙酸酯的负离子。