4-HO-TEMPO-Catalyzed Redox Annulation of Cyclopropanols with Oxime Acetates toward Pyridine Derivatives
作者:Jun-Long Zhan、Meng-Wei Wu、Dian Wei、Bang-Yi Wei、Yu Jiang、Wei Yu、Bing Han
DOI:10.1021/acscatal.9b00832
日期:2019.5.3
for the synthesis of pyridines through the annulation of cyclopropanols and oxime acetates has been developed. This protocol features good functional group tolerance and high chemoselectivity and also promises to be efficient for the late-stage functionalization of skeletons of drugs and natural products. Mechanism studies indicate that the reaction involves the in situ generated α,β-unsaturated ketones
An efficient synthesis of oximes by reaction of carbonyls with acetohydroxamic acid using BF3·OEt2 as a catalyst is described.
描述了通过使用BF 3 ·OEt 2作为催化剂通过羰基与乙酰氧肟酸反应来有效合成肟。
A New Synthesis of Oxime Derivatives from Carbonyl Compounds and<i>N,O</i>-Bis(trimethylsilyl)hydroxylamine
作者:Robert V. Hoffman、Gregory A. Buntain
DOI:10.1055/s-1987-28092
日期:——
Reaction of a series of aldehydes and ketones with the potassium salt of N,O-bis(trimethylsilyl)hydroxylamine (2) gave high yields of the corresponding oximate anion 5. This anion, formed in a Peterson-type reaction, could be protonated to the oxime 7 or trapped in situ with a variety of electrophiles to give O-substituted oxime derivatives.8
A rubber composition comprising a compound having one or more groups represented by formula (X) and a rubber component is provided.
wherein ring W
1
represents a cyclic group having at least one selected from the group consisting of —C(═O)— and —C(═S)—; N
10
represents a nitrogen atom; the at least one selected from the group consisting of —C(═O)— and —C(═S)— in the ring W
1
and N
10
are conjugated; and Z
1
represents —O— or —S—.
Processes for producing alpha-aminonitrile derivatives and alpha-amino acids
申请人:Daicel Chemical Industries, Ltd.
公开号:EP0926135A2
公开(公告)日:1999-06-30
In the presence of a metal catalyst such as a samarium compound, an oxime ester compound shown by the formula (1):
wherein R1, R2, and R3 are the same or different from each other, and each represents a non-reactive atom or a non-reactive organic group; and R2 and R3, together with the adjacent carbon atom, may bond together to form a ring
is reacted with a cyanogenation agent such as an α-cyanohydrin compound (e.g., acetone cyanohydrin)
to form an α-aminonitrile derivative. By hydrolyzing the α-aminonitrile derivative, the corresponding α-amino acid or a salt thereof can be obtained. According to the above processes, an α-aminonitrile derivative and an α-amino acid can be obtained in high yields.