Pharmaceutical compositions containing 1 or 2-mono and dialkyl
申请人:Sharps Associates
公开号:US03946111A1
公开(公告)日:1976-03-23
1,2-Dihydro-4H-thieno-[2,3-c][1]benzopyrans of the formulae ##SPC1## Wherein R is a lower alkyl group having 1 to 5 carbons, R.sub.1 is hydrogen or a lower alkyl group having 1 to 5 carbons, R.sub.2 is a lower alkyl group and R.sub.3 is an alkyl group having 1 to 20 carbon atoms, a phenyl-lower alkyl group or a cycloalkyl-lower alkyl group. The compounds have analgesic, antihypertensive, antidepressant, anticonvulsant, antianxiety, sedative-hypnotic and/or tranquilization activity.
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。
Fiesselmann; Pfeiffer, Chemische Berichte, 1954, vol. 87, p. 848,855
作者:Fiesselmann、Pfeiffer
DOI:——
日期:——
Larsson; Dahlstroem, Svensk Kemisk Tidskrift, 1945, vol. 57, p. 248