Cleavage of the CSe bond of cyclic selenoacetals derived from 4-t-butyl cyclohexanone with butyllithiums and tin and silyl hydrides
摘要:
Selenoacetals derived from 1,3-propanediselenol and 1,2-ethanediselenol are much less Hone to be cleaved by butyllithiums than their open chain analogues. The stereochemistry of the products resulting from these reactions as well as from the cleavage of the C-Se bond under radical conditions is disclosed.
An efficient method for chlorination of alcohols using PPh3/Cl3CCONH2
作者:Wanchai Pluempanupat、Warinthorn Chavasiri
DOI:10.1016/j.tetlet.2006.07.060
日期:2006.9
A new and convenient method for the chlorination of alcohols utilizing PPh3/Cl3CCONH2 is addressed. Various alcohols could smoothly be converted into their corresponding alkyl chlorides in high yield under mild conditions with short reaction times. A mechanism is disclosed with the evidence of inversion of configuration of the analogous alkyl chloride derived from R-(−)-2-octanol.
the reagents: the replacement of methyl by isopropyl groups led to a significant increase of reactivity. We then described a unified procedure for all deoxyhalogenations using the readily available α-chloroenamines as reagents with (bromination, iodination) or without (chlorination) an alkaline bromide or iodide. Finally, we showed that deoxyhalogenation reactions of secondary alcohols were highly
Cobalt-Catalyzed Chelation-Assisted Alkylation of Arenes with Primary and Secondary Alkyl Halides
作者:Naohiko Yoshikai、Ke Gao、Takeshi Yamakawa
DOI:10.1055/s-0033-1338658
日期:——
center to the alkylhalide to form the corresponding alkyl radical, which has a finite lifetime before it undergoes C–C bond formation. Cobalt–N-heterocyclic carbene catalytic systems have been developed for chelation-assisted ortho-alkylation of aromatic compounds with alkylhalides. Aryl imines can be selectively monoalkylated at room temperature by various primary or secondary alkyl chlorides or
Diastereofacial selectivity in reactions of substituted cyclohexyl radicals. An experimental and theoretical study
作者:W. Damm、B. Giese、J. Hartung、T. Hasskerl、K. N. Houk、O. Hueter、H. Zipse
DOI:10.1021/ja00037a007
日期:1992.5
diastereofacial selectivity in reactions of a series of alkyl-substituted cyclohexylradicals has been investigated. In additions of cyclohexylradicals to alkenes, it has been found that only substituents bound at the olefinic center being attacked by the radical influence the equatorial-axial selectivity. Substituents bound to the radical center or axial substituents p to the radical center lead to increased
Methods and compositions of treating a flaviviridae family viral infection
申请人:Einav Shirit
公开号:US20100015093A1
公开(公告)日:2010-01-21
Briefly described, embodiments of this disclosure include compounds, pharmaceutical compositions, methods of treating a host infected with a virus from the Flaviviridae family of viruses, methods of inhibiting HCV replication in a host, methods of inhibiting the binding of NS4B polypeptide to the 3′UTR of HCV negative strand RNA in a host, methods of treating liver fibrosis in a host, and the like.