Intramolecular nitrogen-hydrogen, oxygen-hydrogen and sulfur-hydrogen insertion reactions. Synthesis of heterocycles from .alpha.-diazo .beta.-keto esters
Synthesis of thiophenecarboxamides, thieno[3,4- c ]pyridin-4(5 H )-ones and thieno[3,4- d ]pyrimidin-4(3 H )-ones and preliminary evaluation as inhibitors of poly(ADP-ribose)polymerase (PARP)
作者:Anne E. Shinkwin、William J.D. Whish、Michael D. Threadgill
DOI:10.1016/s0968-0896(98)00210-7
日期:1999.2
Treatment of 3-cyanothiophene with potassium nitrate and concentrated sulphuric acid gave 5-nitrothiophene-3-carboxamide. 4-Nitrothiophene-2-carboxamide and 5-nitrothiophene-2-carboxamide were formed similarly from 2-cyanothiophene. Reduction with tin(II) chloride gave the corresponding aminothiophenecarboxamide salts which were isolated via their N-Cbz derivatives. Lithiation of 3,4-dibromothiophene at
A study of the tautomerism of 2- and 4-ethoxycarbonylthiolan-3-ones implicating stereochemical effects of ring-substitution
作者:F. Duus
DOI:10.1016/s0040-4020(01)98968-9
日期:1981.1
an-3-ones are generally more enolized (40–74%) than the 2-ethoxycarbonylthiolan-3-ones (6–34%), and both series of compounds generally are less enolized than six-membered ring analogues. The extent of enolization of the title compounds is highly influenced by the nature and position of the ring-substitutents. Provable differencies in population of diastereomeric ketone forms related to the same, common
已经合成了一系列的2-和4-乙氧基羰基噻喃-3-酮,并通过1 H NMR和IR光谱进行了研究。在四氯甲烷溶液中互变异构平衡的条件下,与2-乙氧基羰基噻喃-3-酮(6-34%)相比,4-乙氧基羰基噻喃-3-酮通常被更烯化(40–74%),并且这两个系列的化合物通常都更少。比六元环类似物烯醇化。标题化合物的烯醇化程度高度受环取代基的性质和位置影响。根据立体化学鉴定,讨论了与相同,常见的烯醇形式有关的非对映体酮形式的可证明的差异。
Schmid, Helvetica Chimica Acta, 1944, vol. 27, p. 134
作者:Schmid
DOI:——
日期:——
Eistert,B.; Regitz,M., Justus Liebigs Annalen der Chemie, 1963, vol. 666, p. 97 - 112