Enzymatic asymmetric hydroxylation of unnatural substrates with soybean lipoxygenase
作者:J.S. Yadav、S. Nanda、A.Bhaskar Rao
DOI:10.1016/s0957-4166(01)00381-0
日期:2001.8
terminus undergo asymmetrichydroxylation with soybeanlipoxygenase. The prosthetic modifier supplies the missing structural features needed for enzymatic recognition and controls the regiochemical outcome of the reaction by its high hydrophobic content. The effect of pH on the regiochemistry clearly shows that all the substrates can arrange themselves at the active site of soybeanlipoxygenase in only one
Compounds of formula (I):
wherein
R
1
is C
1-8
alkylamino, C
1-8
alkoxy, C
3-7
cycloalkylC
1-6
alkylamino, C
3-7
cycloalkylC
1-6
alkoxy, C
1-3
alkoxyC
2-3
alkoxy, or Het
b
-C
1-3
alkoxy;
Het
b
is a 5- or 6-membered saturated aliphatic heterocycle containing one oxygen atom;
R
2
is —(CH
2
)
n
-Het;
n is an integer having a value of 1 to 4;
Het is a 5- or 6-membered saturated aliphatic heterocycle containing one oxygen heteroatom, which heterocycle may be substituted by one or two C
1-4
alkyl groups, and salts and solvates thereof, are inducers of human interferon and may be useful in the treatment of various disorders in particular infectious diseases, cancer, and allergic diseases and other inflammatory conditions for example allergic rhinitis and asthma, and as vaccine adjuvants.
The present invention includes novel compounds useful in the treatment of various disorders in particular infectious diseases, cancer, and allergic diseases and other inflammatory conditions for example allergic rhinitis and asthma, and as vaccine adjuvants.
The present invention includes novel compounds useful in the treatment of various disorders in particular infectious diseases, cancer, and allergic diseases and other inflammatory conditions for example allergic rhinitis and asthma, and as vaccine adjuvants.
Room Temperature Hydroalkylation of Electron-Deficient Olefins: sp<sup>3</sup> C−H Functionalization via a Lewis Acid-Catalyzed Intramolecular Redox Event
作者:Stefan J. Pastine、Kevin M. McQuaid、Dalibor Sames
DOI:10.1021/ja053337f
日期:2005.9.1
A practical method for the intramolecular hydroalkylation of electron-deficient olefins has been developed. The direct transformation of benzylic, tertiary, and sterically hindered secondary sp3 C-H bonds into C-C bonds under the action of a catalytic amount of a variety of Lewis acids is described. The mechanism of these transformations is proposed to involve a tandem hydride transfer/cyclization sequence.