Transformations of Alkyl 2-(2,2-Disubstituted-ethenyl)amino-3-dimethylaminoprop-2-enoates: Synthesis of Alkyl 3,4-Disubstituted- and Alkyl 1-Acyl-3,4-disubstituted Pyrrole-2-carboxylates
分三步,由乙酰丙酮(1)经由4-(N,N-二甲基氨基)-3-乙酰丁-3-烯-2-酮(2)和2- [双(乙酰基乙烯基)氨基丙酸甲酯(4)制备N- [2,2-双(乙酰基)乙烯基]甘氨酸甲酯(3)。化合物4与N-和C-亲核试剂反应生成稠合的杂环系统。分别由2-氨基吡啶和2-氨基噻唑制备吡啶并[1,2- a ]嘧啶酮14-16和噻唑并[3,2- a ]嘧啶酮17和18的衍生物。用C制备了吡啶并[1,2- a ]-吡啶酮19和2 H -1-苯并吡喃-2-酮20-22的-亲核试剂衍生物。
Transformations of methyl 2-(2,2-disubstituted-ethenyl)amino-3-dimethylaminopropenoates. The synthesis of methyl 1-heteroaryl-1<i>H</i>-imidazole-4-carboxylates
作者:Lovro Selič、Branko Stanovnik
DOI:10.1002/jhet.5570350652
日期:1998.11
Transformations of intermediates 4, prepared from methyl2-(2,2-disubstituted-ethenyl)amino-3-dimethylaminopropenoates 2 and sterically hindered heteroarylamines 3, into methyl1-heteroaryl-1H-imidazole-4-carboxylates 7 are described.
中间体的转变4,从甲基制备的2-(2,2-二取代-乙烯基)氨基-3- dimethylaminopropenoates 2和空间位阻heteroarylamines 3,成甲基1-杂芳基- 1 H ^ -咪唑-4-羧酸7中描述。
A SIMPLE STEREOSELECTIVE ONE POT CONVERSION OF COMPOUNDS WITH A DIMETHYLAMINOMETHYLENE GROUP INTO ENOL ESTERS
A simple stereoselective synthesis of 2Z and 2Z,1′E alkyl 3-acyloxy-2-(2,2-disubstituted ethenyl) aminopropenoates 4 from alkyl 2-(2,2-disubstituted ethenyl)amino-3-dimethylaminopropenoates 1 in 12–91% yield is presented.
Simple and stereoselective syntheses of aplysinopsins and their analogs from either methyl 2-[(2,2 disubstituted ethenyl)amino]-3-(dimethylamino)prop-2-enoates or 5-[(dimethylamino)methylidene]imidazolidine-2,4-diones 20 are described. The structures of products are established by H-1 and C-13-NMR. and NOESY spectroscopy, and X-ray crystal-structure analysis.