We report the formal synthesis of angiogenesis inhibitor NM-3 (1) in six steps from either of the 2,4-dimethoxyhalobenzenes 13a,b or 3,5-dimethoxychlorobenzene (13c). The first key reaction is the regiospecific alkylation/rearrangement between the aryne derived from 13a-c with sodium diethylmalonate in THF to produce diester 11, which after hydrolysis and cyclization affords homophthalic anhydride 3. The second is the reaction of anhydride 3 with either ethyl 2-methylmalonate (28a), in the presence of 1,1'-carbonyldiimidazole, or ethyl-2-methylmalonyl chloride (28b) under basic conditions to afford key isocoumarin 27. The conversion of 27 constitutes a formal synthesis of NM-3.
The present invention provides a process from preparing isocoumarin-3-yl derivatives comprising reacting a homophthalic anhydride derivative with a carbonyl compound, wherein the carbonyl group is substituted with an acyl activating group, in the presence of a reaction medium comprising a solvent and a base. The invention also encompasses a process for the preparation of homophthalate esters useful in the preparation of homophthalic anhydride reactants as well as an integrated process wherein the twp reactions are carried out sequentially to afford the desired isocoumarin derivative.
The present invention provides a process for the preparation of homophthlate esters useful in the preparation of homophthalic anhydride reactants.
本发明提供了一种制备同苯二甲酸酯的方法,该方法有助于制备同苯二甲酸酐反应物。
Kamal et al., Journal of the Chemical Society, 1950, p. 3375,3378
作者:Kamal et al.
DOI:——
日期:——
Sinha, N. K.; Sarkhel, B. K.; Srivastava, Jagdish N., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1986, vol. 25, p. 640 - 643
作者:Sinha, N. K.、Sarkhel, B. K.、Srivastava, Jagdish N.
DOI:——
日期:——
SINHA N. K.; SARKHEL B. K.; SRIVASTAVA JAGDISH N., INDIAN J. CHEM., 25,(1986) N 6, 640-643
作者:SINHA N. K.、 SARKHEL B. K.、 SRIVASTAVA JAGDISH N.