Regioselective Ring Expansion of 3-Ylideneoxindoles with Tosyldiazomethane (TsDAM): A Metal-Free and Greener Approach for the Synthesis of Pyrazolo-[1,5-<i>c</i>]quinazolines
An efficient, metal-free approach to access pyrazolo-[1,5-c]quinazolines with 3-ylideneoxindoles and tosyldiazomethane (TsDAM) under mild aqueous reaction conditions has been developed and the solvent involvement in the present reaction has also been explored for the first time. This greener approach involves 1,3-dipolar cycloaddition, regioselective ring expansion, followed by the elimination of tosyl
在温和的水性反应条件下,开发了一种高效,无金属的方法,可与3-亚硝基氧吲哚和甲苯磺酰重氮甲烷(TsDAM)接触吡唑并-[1,5- c ]喹唑啉,并探索了该反应中涉及的溶剂。第一次。这种更环保的方法涉及1,3-偶极环加成,区域选择性环扩环,然后在一次操作中用含水碱消除甲苯磺酰基,并且可以高纯度分离产物,而无需柱色谱分离。该方法还与多种官能团兼容,在水中提供了良好或优异的收率,从而减少了制药行业对环境的影响。
A facile and metal-free domino reaction of TsDAM and 2-alkenylarylaldehyde: An easy access to 8-hydroxy-2,8-dihydro indeno [2,1-<i>c</i>]pyrazoles
An efficient straightforward metal free domino approach was developed for the synthesis of various 8-hydroxy-2,8-dihydroindeno[2,1-c]pyrazoles via [3 + 2] cycloaddition of substituted alkenes and TsDAM (TosylDiAzoMethane). The salient features of this protocol include high efficiency, mild reaction conditions, greener solvent, metal-free reaction, scalability and broad substrate scope along with high
开发了一种有效的直接无金属多米诺骨牌方法,用于通过取代烯烃和 TsDAM(TosylDiAzoMethane)的 [3 + 2] 环加成合成各种 8-羟基-2,8-二氢茚并[2,1- c ]吡唑。该协议的显着特点包括高效、温和的反应条件、更环保的溶剂、无金属反应、可扩展性和广泛的底物范围以及高区域选择性和产量。
Positive photoresist composition
申请人:——
公开号:US20010041303A1
公开(公告)日:2001-11-15
Provided is a positive photoresist composition which comprises (A) a resin which contains a repeating unit represented by formula (I) shown below and a repeating unit represented by formula (II) shown below and whose solubility in an alkaline developing solution increases by the action of an acid and (B) a compound which generates an acid upon irradiation with an actinic ray or radiation,
1
wherein R
1
, R
2
and R
3
each independently represents an alkyl group, a haloalkyl group, a halogen atom, an alkoxy group, a trialkylsilyl group or a trialkylsilyloxy group; and n represents
0
or
1,
2
wherein M represents an atomic group necessary for forming an alicyclic structure, which may be substituted, together with the connected two carbon atoms (C-C); and R
11
and R
12
each independently represents a hydrogen atom, a cyano group, a halogen atom or an alkyl group which may be substituted.
for the synthesis of 2,4,5-trisubstituted oxazoles has been developed from the direct coupling of α-diazoketones with aryl or alkyl nitriles. The reaction proceeds through the formation of nitrilium ion by the nucleophic addition of nitrile onto diazo functionality followed by an intramolecular trapping of nitrilium ion by keto group. Both aryl, and alkyl nitriles underwent smooth cyclocondensation
Negativ arbeitendes strahlungsempfindliches Gemisch und daraus hergestelltes Aufzeichnungsmaterial
申请人:HOECHST AKTIENGESELLSCHAFT
公开号:EP0444493A2
公开(公告)日:1991-09-04
Es wird ein negativ arbeitendes strahlungsempfindliches Gemisch beschrieben, das als wesentliche Bestandteile
a) eine bei Bestrahlung eine starke Säure bildende Verbindung der allgemeinen Formel
worin
R¹einen Rest R²-SO₂- oder R³-C(O)-,
R² und R³voneinander unabhängig einen ggf. substituierten Alkyl-, Cycloalkyl-, Aryl- oder Heteroarylrest bedeuten,
b) eine Verbindung mit mindestens zwei durch Säure vernetzbaren reaktiven Gruppen und
c) ein in Wasser unlösliches, in wäßrig-alkalischen Lösungen lösliches oder zumindest quellbares Bindemittel
enthält.
Das erfindungsgemäße strahlungsempfindliche Gemisch zeichnet sich durch eine hohe Empfindlichkeit über einem weiten Spektralbereich aus. Es zeigt ebenso eine hohe thermische Stabilität und bildet bei Belichtung keine korrodierenden Photolyseprodukte.
描述了一种消极工作的辐射敏感混合物,其主要成分是
a) 在辐照下形成强酸的化合物,其通式为
其中
R¹ 是自由基 R²-SO₂- 或 R³-C(O)-、
R² 和 R³ 各自表示任选取代的烷基、环烷基、芳基或杂芳基、
b) 具有至少两个可酸性交联反应基团的化合物,以及
c) 不溶于水、可溶于或至少可溶于碱性水溶液的粘合剂
在碱性水溶液中。
根据本发明制成的辐射敏感混合物具有在宽光谱范围内灵敏度高的特点。它还具有很高的热稳定性,在光照下不会形成腐蚀性光解产物。