Copper-Catalyzed Benzylic C−H Oxygenation under an Oxygen Atmosphere via N-H Imines as an Intramolecular Directing Group
摘要:
Copper-catalyzed benzylic C-H oxygenation under an oxygen atmosphere was developed starting from carbonitriles and Grignard reagents via N-H imine intermediates. The present process is characterized by the following two-step sequence in a one-pot manner: (1) addition of Grignard reagents to carbonitriles to form N-H imines and (2) benzylic C-H oxygenation (C=O bond formation) triggered by 1,5-hydrogen atom transfer with transient iminyl copper species.
sphinomethyl)cyclopentane as a catalyst, a range of aryl bromides and chlorides undergoes Suzuki cross-coupling with alkylboronic acids in good yields. Several alkyl substituents such as ethyl, n-butyl, n-octyl, isobutyl or 2,2-dimethylpropyl on the alkylboronic acids have been successfully used. The functional group tolerance on the arylhalide is remarkable; substituents such as fluoro, methyl, methoxy
通过使用[PdCl(C 3 H 5)] 2 /顺式,顺式,顺式-1,2,3,4-四(二苯基膦甲基)环戊烷作为催化剂,一系列芳基溴化物和氯化物进行铃木交叉偶联与烷基硼酸的收率很好。几个烷基取代基,例如乙基,正丁基,n已经成功地使用了烷基硼酸上的-辛基,异丁基或2,2-二甲基丙基。芳基卤对官能团的耐受性显着;可以容忍诸如氟,甲基,甲氧基,乙酰基,甲酰基,苯甲酰基,硝基或腈之类的取代基。此外,该催化剂即使在位阻芳基溴的反应中也可以低负荷使用。
The present invention provides compounds of formula (I): Formula (I) compositions comprising such compounds; the use of such compounds in therapy; and methods of treating patients with such compounds; wherein A, Y, n, R1, R2A, R2B, R3 and *1 are as defined herein.
Substrate‐Mediator Duality of 1,4‐Dicyanobenzene in Electrochemical C(sp<sup>2</sup>)−C(sp<sup>3</sup>) Bond Formation with Alkyl Bromides
作者:Brandon Johnston、Daniel M. Loh、Daniel G. Nocera
DOI:10.1002/anie.202312128
日期:2023.12.4
4-Dicyanobenzene acts as a substrate and a mediator in an electrochemical C(sp2)−C(sp3) bond-formingreaction with alkyl bromides. The reaction conditions avoid competing alkyl radical homocoupling and allows for the accommodation of alkyl bromides with oxidatively sensitive and acidic functional groups that are difficult to incorporate using alternative C(sp3) precursors.
Nouveaux phénols di-ortho substitués dont une des substitutions est un hétérocycle, leur procédé de préparation, médicaments les contenant, notamment anti-hypertenseurs et nouveaux intermédiaires de synthèse
申请人:CARPIBEM (CENTRE D'ACTIVITE ET DE
RECHERCHE PHARMACEUTIQUE INDUSTRIELLE
BIOLOGIQUE ET MEDICALE)
Société Anonyme dite:
公开号:EP0070779A2
公开(公告)日:1983-01-26
L'invention concerne de nouveaux composés de formule:
Anti-hypertenseurs.
本发明涉及新的式化合物:
抗高血压剂。
PROCESS FOR PRODUCING TETRAZOLE COMPOUND AND INTERMEDIATE THEREFOR
申请人:SUMITOMO CHEMICAL COMPANY LIMITED
公开号:EP0711762A1
公开(公告)日:1996-05-15
There are disclosed an industrially favorable process for producing a tetrazole compound of general formula (1):
characterized in that a nitrile of general formula (2):
R¹CN (2)
is reacted with hydrazine or a salt thereof in the presence of a catalyst, followed by reaction with a nitrous acid compound of general formula (3):
ANO₂ (3)
or a nitrile of general formula (2) is reacted with hydrogen sulfide, followed by reaction with an alkyl halide of general formula (4):
R⁴J (4)
with hydrazine or a salt thereof, and then with a nitrous acid compound of general formula (3); and an intermediate of general formula (5):
R¹C(=R⁵)R⁶ (5)
which is useful for the production of the tetrazole compound (in which R¹ to R⁶, A and J in the above formulas are as defined in the specification).