Compounds containing an active methylene group, and process of preparing the same
申请人:MERCK & CO INC
公开号:US02422598A1
公开(公告)日:1947-06-17
Process of making acetylacetylamino acetone and the product thereof
申请人:MERCK & CO INC
公开号:US02306765A1
公开(公告)日:1942-12-29
Chemical synthesis and biological activities of 5-deazaaminopterin analogs bearing substituent(s) at the 5- and/or 7-position(s)
作者:Tsann Long Su、Jai Tung Huang、Ting Chao Chou、Glenys M. Otter、Francis M. Sirotnak、Kyoichi A. Watanabe
DOI:10.1021/jm00401a023
日期:1988.6
Condensation of cyanothioacetamide (4) with ethyl alpha-(ethoxymethylene)acetoacetate (5b), ethyl 4-ethoxy-2-(ethoxymethylene)-3-oxobutanoate (5c), ethyl 2-(ethoxymethylene)-3-oxo-4-phenylpropanoate (5d) afforded exclusively the corresponding 6-substituted pyridines (6b-d). Cyclization of 4 with 3-carbethoxybutane-2,4-dione (5e) gave 3-cyano-5-(ethoxycarbonyl)-4,6-dimethylpyridine-2(1H)-thione (6e)