本文描述了铁/光氧化还原双催化酰基氮烯的形成以及酰基氮烯在构建各种 C-O 键中对苯酞的应用。开发的反应从N -methoxyl-2-alkylbenzamides 开始。机理调查表明,该反应涉及基于铁氮烯的氢原子提取 (HAA)、自由基-极性交叉和O-亲核 S N 1。值得注意的是,未观察到以前出版物中经常报道的自由基反弹。该反应代表了基于酰基氮烯的苯酞合成的第一个例子。此外,它还作为合成3-丁基苯酞(NBP)、沙利度胺、Pomalyst和Otezia等市售药物的补充剂。
Iodoarene-Catalyzed Stereospecific Intramolecular sp3 C–H Amination: Reaction Development and Mechanistic Insights
摘要:
A new strategy is reported for intramolecular Sp(3) C-H amination :under mild reaction conditions using iodoarene as catalyst and m-CPBA as oxidant. This C-H functionalization involving iodine(III) reagents generated in situ occurs readily at sterically hindered tertiary C-H bonds. DFT (M06-2X) calculations show that the preferred pathway involves an iodonium cation intermediate and proceeds via an energetically concerted transition state, through hydride transfer followed by the spontaneous C-N bond formation. ThiS leads to the experimentally observed amination at a chiral center without loss of stereo chemical information.
Visible Light-Promoted Magnesium, Iron, and Nickel Catalysis Enabling C(sp<sup>3</sup>)–H Lactonization of 2-Alkylbenzoic Acids
作者:Sasa Li、Mincong Su、Jie Sun、Kunjun Hu、Jian Jin
DOI:10.1021/acs.orglett.1c01984
日期:2021.8.6
patterns could be transformed into the corresponding phthalide products. Based on the mechanistic experimentation and reported prior studies, a possible mechanism for the benzylic oxidative lactonization reaction was proposed with the hypothetic photoactive ternary complex formed between the 2-alkylbenzoic acid substrate, magnesium ion, and bromate anion.
Nickel-Catalyzed Cross-Coupling of Alkyl Zinc Halides for the Formation of C(sp<sup>2</sup>)C(sp<sup>3</sup>) Bonds: Scope and Mechanism
作者:Vilasâ B. Phapale、Manuel Guisán-Ceinos、Elena Buñuel、Diegoâ J. Cárdenas
DOI:10.1002/chem.200901913
日期:2009.11.23
Optimal conditions for a general Ni‐catalysed Negishi cross‐coupling of alkyl zinc halides with aryl, heteroaryl and alkenyl halides have been determined. These conditions allow the reaction to take place smoothly, with low catalyst loading, and in the presence of a wide variety of functional groups to afford products in good yields at room temperature. DFT studies on the mechanism support the occurrence
Uncatalyzed CO2Li-Mediated SNAr Reaction of Unprotected Benzoic Acids via Silicon Trickery
作者:Mickael Belaud-Rotureau、Anne-Sophie Castanet、Thi Huu Nguyen、Jacques Mortier
DOI:10.1071/ch15398
日期:——
and aryllithium nucleophilic aromatic substitution (SNAr) displacement of a fluoro or methoxygroup from unprotected 2-fluoro/methoxybenzoic acids is discussed. It was discovered that a TMS group located at the C6-position ortho to the carboxyl group shields effectively the carboxylate against nucleophilic attack, thus reducing dramatically ketone formation, and reorients nucleophilic substitution to
PHOTOSENSITIVE COMPOSITION, PATTERN FORMING METHOD USING THE PHOTOSENSITIVE COMPOSITION AND COMPOUND FOR USE IN THE PHOTOSENSITIVE COMPOSITION
申请人:Wada Kenji
公开号:US20100233617A1
公开(公告)日:2010-09-16
A photosensitive composition includes: (A) a resin containing a repeating unit corresponding to a compound represented by the following formula (I); the resin being capable of producing an acid group upon irradiation with an actinic ray or radiation:
Z-A-X—B—R (I)
wherein Z represents a group capable of becoming an acid group resulting from leaving of a cation upon irradiation with an actinic ray or radiation; A represents an alkylene group; X represents a single bond or a heteroatom-containing divalent linking group; B represents a single bond, an oxygen atom or —N(Rx)-; Rx represents a hydrogen atom or a monovalent organic group; R represents a monovalent organic group substituted by Y; when B represents —N(Rx)-, R and Rx may combine with each other to form a ring; and Y represents a polymerizable group.