Method for producing anellated tetrahydro-{1h}-triazoles
申请人:——
公开号:US20040097728A1
公开(公告)日:2004-05-20
The present invention relates to a process for preparing fused tetrahydro-[
1
H]-triazoles of the formula I
1
where the variables R
a
, Z, Z
1
, X, W, n and Q are as defined in claim 1, by cyclization of compounds of the formula II
2
where R is C(X)OR
2
or C(X)SR
2
, where X is oxygen or sulfur, and R
2
is as defined in claim 1, in the presence of a base.
The invention also relates to compounds of the formula I where W is sulfur if Z is a methylene group optionally substituted by R
a
, and furthermore to compounds of the formula I where Q is a benzoxazole or benzothiazole radical, and to the use of these compounds as herbicides.
The Biological Effects of Structural Variation at the Meta Position of the Aromatic Rings and at the End of the Alkenyl Chain in the Alkenyldiarylmethane Series of Non-Nucleoside Reverse Transcriptase Inhibitors
作者:Guozhang Xu、Mark Micklatcher、Maximilian A. Silvestri、Tracy L. Hartman、Jennifer Burrier、Mark C. Osterling、Heather Wargo、Jim A. Turpin、Robert W. Buckheit,、Mark Cushman
DOI:10.1021/jm010212m
日期:2001.11.1
In an effort to elucidate a set of structure-activityrelationships in the alkenyldiarylmethane (ADAM) series of non-nucleoside reverse transcriptase inhibitors, a number of modifications were made at two locations: (1) the meta positions of the two aromatic rings and (2) the end of the alkenyl chain. Forty-two new ADAMs were synthesized and evaluated for inhibition of the cytopathic effect of HIV-1(RF)
(55% yield). The byproducts were mainly ring-hydrogenation compounds (tetrahydrofuran-2-carboxylic acid and its ester) and undetected ones (loss of carbon balance). The catalyst was gradually deactivated during reuses even at a reaction temperature of 373 K; however, the catalytic activity was recovered by calcination at 573 K. The reactions of various related substrates were carried out, and it was
研究了由糠醛氧化产生的2-呋喃甲酸(FCA)转化为5-羟基戊酸(5-HVA)及其与H 2的酯/内酯衍生物。单金属Pt催化剂有效,而其他贵金属由于形成环加氢产物而无效。载体和溶剂对性能的影响不大。但是,Pt / Al 2 O 3是最好的催化剂,短链醇(例如甲醇)是更好的溶剂。最佳反应温度为约373 K,并且在较高温度下,通过有机材料在催化剂上的沉积,催化剂急剧失活。目标产物(5-HVA,δ-戊内酯(DVL)和5-羟基戊酸甲酯)的最高产率为62%,主要以5-羟基戊酸甲酯形式获得(产率为55%)。副产物主要是环氢化化合物(四氢呋喃-2-羧酸及其酯)和未被发现的化合物(碳平衡损失)。在再利用过程中,即使在373 K的反应温度下,催化剂也会逐渐失活。然而,通过在573 K下煅烧可以恢复催化活性。进行了各种相关底物的反应,发现在O–C中存在O–C键C结构(呋喃环的1,2,3-位)在C C氢化之前被解离
Transesterification via Baeyer–Villiger oxidation utilizing potassium peroxydisulfate (K2S2O8) in acidic media
作者:S. Zarrabi、N. O. Mahmoodi、O. Marvi
DOI:10.1007/s00706-010-0338-9
日期:2010.8
AbstractBaeyer–Villiger oxidation of ketones with potassium peroxydisulfate (K2S2O8) and sulfuricacid generates the anticipated esters or lactones. These products are transformed into new esters (or hydroxy esters) in the presence of alcohols via transesterification under Baeyer–Villiger reaction conditions in one pot. Graphical Abstract
摘要用过氧二硫酸钾(K 2 S 2 O 8)和硫酸进行的拜耳-维利格酮氧化反应产生了预期的酯或内酯。在拜耳-维利格反应条件下,在一锅中在酯存在下通过酯交换将这些产物转化为新的酯(或羟基酯)。 图形概要
3-Arylisothiazoles and their use as herbicides
申请人:——
公开号:US20040023807A1
公开(公告)日:2004-02-05
3-Arylisothiazoles of the formula I
1
in which the variables X, Q, R
1
, R
2
, R
3
, R
4
, R
5
are as defined in claim 1, and salts thereof, and their use for controlling harmful plants, are described.