A hydrogen-bonded chain of rings in 7-amino-5-tert-butyl-2-methylpyrazolo[1,5-a]pyrimidine, and a hydrogen-bonded framework structure in 3,7-diamino-2,5-dimethylpyrazolo[1,5-a]pyrimidine monohydrate
摘要:
In 7-amino-5-tert-butyl-2-methylpyrazolo[1,5-a] pyrimidine, C11H16N4, which crystallizes with Z' = 2 in the space group P (1) over bar, the independent molecules are linked by four N-H center dot center dot center dot N hydrogen bonds into chains containing three types of ring. In 3,7-diamino-2,5-dimethylpyrazolo[1,5-a] pyrimidine monohydrate, C8H11N5 center dot H2O, the molecular components are linked into a three-dimensional framework structure by a combination of O-H center dot center dot center dot N, N-H center dot center dot center dot N and N-H center dot center dot center dot O hydrogen bonds.
A series of 5-amino-1-aroylpyrazoles 3 are synthesized directly by the reaction of beta-aminocrotononitrile 1 with some structures containing the hydrazine moiety (X-NHNH2) 2 by refluxing ethanol in presence of sodium acetate. When semicarbazide 3i was used (X = CONH2), the reaction afforded the unexpected 7-aminopyrazolo[1,5-a]pyrimidine 4. (C) 2008 Elsevier Ltd. All rights reserved.
New derivatives of pyrazolo[1,5-a]pyrido[3,2-e]-pyrimidine-7-carboxylic acid have the general formula ##STR1## The new compounds are useful as central nervous system depressants and an anti-inflammatory agents.
Electrooxidative C-H Functionalization of Heteroarenes. Thiocyanation of Pyrazolo[1,5-<i>a</i>
]pyrimidines
作者:Vladimir A. Kokorekin、Rauza R. Yaubasarova、Sergei V. Neverov、Vladimir A. Petrosyan
DOI:10.1002/ejoc.201900390
日期:2019.7.14
An effective system of approaches to electrooxidative C–H thiocyanation of both high and low reactive pyrazolo[1,5‐a]pyrimidines under mild conditions has been proposed for the first time. The process scaling up, the antifungal activity of resulting thiocyanates, and possibility of their transformation into thiols also demonstrate advantages and viability of this direct C–S coupling strategy. In general
首次提出了在温和条件下有效反应高和低反应性吡唑并[1,5- a ]嘧啶的C–H硫氰化方法的有效体系。规模扩大的过程,所得硫氰酸盐的抗真菌活性以及将其转化为硫醇的可能性也证明了这种直接C-S偶联策略的优势和可行性。通常,温和的反应条件和高的C–S键形成效率使这种基于吡唑并[1,5- a ]嘧啶的电氧化C–H硫氰化的策略在未来的应用中非常可行。
Etchant, replenishment solution and method for forming copper wiring
申请人:MEC COMPANY LTD.
公开号:US10174428B2
公开(公告)日:2019-01-08
An etchant for copper includes an acid and one or more compounds selected from the group consisting of an aliphatic noncyclic compound, an aliphatic heterocyclic compound and a heteroaromatic compound. The aliphatic noncyclic compound is a saturated aliphatic noncyclic compound (A) including only two or more nitrogen atoms as heteroatoms, and 2 to 10 carbon atoms. The aliphatic heterocyclic compound is a compound (B) including a five-, six-, or seven-membered ring having one or more nitrogen atoms as one or more heteroatoms constituting the ring. The heteroaromatic compound is a compound (C) including a six-membered heteroaromatic ring having one or more nitrogen atoms as one or more heteroatoms constituting the ring.
7-Amino-2,5-dimethylpyrazolo[1,5-<i>a</i>]pyrimidine hemihydrate redetermined at 120 K: a three-dimensional hydrogen-bonded framework
作者:Jaime Portilla、Jairo Quiroga、Justo Cobo、John N. Low、Christopher Glidewell
DOI:10.1107/s0108270106005373
日期:2006.3.11
In the title compound, C8H10N4 center dot 0.5H(2)O, where the water molecules lie on twofold rotation axes in the space group C2, the components are linked by three hydrogen bonds, one each of O - H center dot center dot center dot N, N - H center dot center dot center dot N and N - H center dot center dot center dot O types, into a complex three-dimensional framework structure.
Monoazofarbstoffe, deren Herstellung und Verwendung