Acyclic Diastereoselection in Prochiral Radical Addition to Prochiral Olefins
作者:Mukund P. Sibi、Tara R. Rheault、Sithamalli V. Chandramouli、Craig P. Jasperse
DOI:10.1021/ja017510t
日期:2002.3.1
reactive halogenated radicals (6f,g) (>15:1 anti). Steric influence in alkyl radical additions was difficult to evaluate due to decreased reactivity when using bulky reaction partners; however, more reactive alpha-alkoxy radicals, it was found that increasing steric bulk leads to moderate increases in selectivity. In addition, higher selectivity was observed when employing lanthanide Lewis acids whose environment
Factors in the formation of isomerically and optically pure alkyl halides. Part V. Conditions which determine the formation of 2-halogeno-2-methyl- and 2-halogeno-3-methyl-butanes in the preparation of 1-halogeno-2,2-dimethylpropanes from 2,2-dimethylpropan-1-ol
作者:H. R. Hudson
DOI:10.1039/j29680000664
日期:——
that the preparation of 1-halogeno-2,2-dimethylpropanesfrom the corresponding alcohol may be accompanied by the formation of 2-halogeno-2-methylbutanes and 2-halogeno-3-methylbutanes. The latter are frequently observed in bromide or iodide systems and are thought to result from isomerization of the first formed t-halides. Rearrangements occurring during the reactions of 2,2-dimethylpropan-1-ol with the
Novel imidazolidinedione derivatives and use thereof as drugs
申请人:——
公开号:US20040110811A1
公开(公告)日:2004-06-10
The present invention is to provide an imidazolidinedione derivative and oxazolidinedione derivative represented by the following general Formula (I) having the chymase and/or tryptase inhibition activity
1
[wherein R
1
and R
2
are the same or different, and denote a lower alkyl group or a phenyl group, or R
1
and R
2
are taken together to form a ring, R
3
denotes an optionally substituted naphthyl group or heterocyclic group, A denotes oxygen or NR
4
(R
4
is hydrogen or optionally substituted lower alkyl group), or NB
2
R
5
(R
5
is aryl group, and B
2
is carbonyl group or sulfonyl group), and B
1
denotes a carbonyl group or a sulfonyl group], or a pharmaceutically acceptable salt thereof.
Imidazolidinedione derivatives and use thereof as drugs
申请人:Sakai Yusuke
公开号:US06919365B2
公开(公告)日:2005-07-19
The present invention is to provide an imidazolidinedione derivative and oxazolidinedione derivative represented by the following general Formula (I) having the chymase and/or tryptase inhibition activity
[wherein R
1
and R
2
are the same or different, and denote a lower alkyl group or a phenyl group, or R
1
and R
2
are taken together to form a ring, R
3
denotes an optionally substituted naphthyl group or heterocyclic group, A denotes oxygen or NR
4
(R
4
is hydrogen or optionally substituted lower alkyl group), or NB
2
R
5
(R
5
is aryl group, and B
2
is carbonyl group or sulfonyl group), and B
1
denotes a carbonyl group or a sulfonyl group], or a pharmaceutically acceptable salt thereof.