β-Lactam Synthesis via Copper-Catalyzed Directed Aminoalkylation of Unactivated Alkenes with Cyclobutanone <i>O</i>-Benzoyloximes
作者:Heng Zhang、Xiaoyan Lv、Hanrui Yu、Zibo Bai、Gong Chen、Gang He
DOI:10.1021/acs.orglett.1c01007
日期:2021.5.7
amide-directed Cu-catalyzed aminoalkylation of unactivated alkenes using cyclobutanone oxime esters as alkyl radical donors is developed. Both primary and secondaryalkyl groups can be selectively installed at the C4 position of terminal or cis-internal 3-alkenamides in moderate to good yield. This reaction offers a useful method for the diastereoselective synthesis of β-lactams bearing 4-cyanoalkyl β-substituents
[EN] 5, 7-SUBSTITUTED-IMIDAZO [1, 2-C] PYRIMIDINES AS INHIBITORS OF JAK KINASES<br/>[FR] [1,2-C]PYRIMIDINES 5,7-IMIDAZO-SUBSTITUÉES COMME INHIBITEURS DE JAK KINASES
申请人:ARRAY BIOPHARMA INC
公开号:WO2011130146A1
公开(公告)日:2011-10-20
Compounds of Formula I: (Formula should be inserted here) and stereoisomers and pharmaceutically acceptable salts and solvates thereof in which R1, R2, R3, R4, R5, R6, R7, X1 and X2 have the meanings given in the specification, are inhibitors of one or more JAK kinases and are useful in the treatment of autoimmune diseases, inflammatory diseases, rejection of transplanted organs, tissues and cells, as well as hematologic disorders and malignancies and their co-morbidities.
Acid-catalyzed reactions of a strained ring nazarov substrate
作者:April Gu Gruhn、William Reusch
DOI:10.1016/s0040-4020(01)88035-2
日期:1993.9
The synthesis and acid-catalyzed rearrangements of cross-conjugated cyclobutylidene ketone 1 are described. With strong Bronsted acids it gave a mixture of 5,7-dimethyltetralin 10 and 2-cyclohexenyl-1-methyl-3-phenylbenzene 11, the former by an initial retroaldol reaction and the latter by a series of tautomerizations and electrocyclic reactions following cation induced four-membered ring cleavage
Nickel-Catalyzed Favorskii-Type Rearrangement of Cyclobutanone Oxime Esters to Cyclopropanecarbonitriles
作者:Ping Fang、Tian-Sheng Mei、Bin Shuai
DOI:10.1055/s-0039-1690872
日期:2021.10
A nickel-catalyzed base-promoted rearrangement of cyclobutanone oxime esters to cyclopropanecarbonitriles was developed. The ring opening of cyclobutanone oxime esters occurs at the sterically less hindered side. A base-promoted nickelacyclobutane intermediate, formed in situ, is assumed to be involved in the formation of the product.
Direct Syntheses of Spiro- and Fused-Hydrofurans by a Tunable Tandem Semipinacol Rearrangement/Oxa-Michael Addition Protocol
作者:Bao-Sheng Li、Wen-Xing Liu、Qing-Wei Zhang、Shao-Hua Wang、Fu-Min Zhang、Shu-Yu Zhang、Yong-Qiang Tu、Xiao-Ping Cao
DOI:10.1002/chem.201300205
日期:2013.4.22
one‐pot reaction has been developed involving a tandemsemipinacolrearrangement/oxa‐Michael addition sequence in which the in situ generated ketol diene intermediate can be transformed specifically to either the spiro‐ or fused‐dihydrofuran products (see scheme). This one‐pot tandem reaction represents a general synthetic methodology for the syntheses of the two different kinds of furan derivatives