Crotylations of α-Carbonyl Radicals with Crotylstannane
摘要:
[GRAPHICS]Electrophilic radicals undergo crotylation with crotylstannane with moderate to good efficiency. The reaction provides the syn isomer as the major product. The present methodology is complementary to Claisen protocols for the synthesis of gamma,delta-unsaturated carboxylic acid derivatives. Details of the new radical methodology are presented.
[EN] NOVEL PSEUDOPEPTIDE BRADYKININ RECEPTOR ANTAGONISTS<br/>[FR] NOUVEAUX ANTAGONISTES PSEUDOPEPTIDIQUES DE RECEPTEURS DE BRADYKININE
申请人:SCIOS NOVA INC.
公开号:WO1994008607A1
公开(公告)日:1994-04-28
(EN) The substitution of at least one of the amino acids in positions 2 to 5 of the bradykinin peptide with a fatty acid amine converts bradykinin agonists into a bradykinin antagonist. The invention further includes the intermediate compounds and additional modifications at other positions within the modified bradykinin antagonists which increase enzyme resistance, antagonist potency and/or specificity of the new bradykinin antagonists. The analogs produced are useful in treating conditions and diseases of a mammal and human in which an excess of bradykinin or related kinins are produced or injected as by insect bites.(FR) La substitution d'au moins l'un des acides aminés dans les positions 2 à 5 du peptide bradykinine par une amine d'acide gras permet de transformer des agonistes de bradykinine en un antagoniste de bradykinine. L'invention se rapporte en outre à des composés intermédiaires et à des modifications supplémentaires effectuées au niveau d'autres positions dans les antagonistes de bradykinine modifiés qui permettent d'augmenter la résistance enzymatique, la puissance antagoniste et/ou la spécificité des nouveaux antagonistes de bradykinine. Les analogues produits peuvent être utilisés pour traiter des états et des maladies chez les mammifères et chez l'homme, impliquant la production ou l'injection d'un excédent de bradykinine ou de kinines apparentées, par exemple par des piqûres d'insectes.
Crotylations of α-Carbonyl Radicals with Crotylstannane
作者:Mukund P. Sibi、Hideto Miyabe
DOI:10.1021/ol026510a
日期:2002.10.1
[GRAPHICS]Electrophilic radicals undergo crotylation with crotylstannane with moderate to good efficiency. The reaction provides the syn isomer as the major product. The present methodology is complementary to Claisen protocols for the synthesis of gamma,delta-unsaturated carboxylic acid derivatives. Details of the new radical methodology are presented.
Substrate steric effects in enantioselective Lewis acid promoted free radical reactions
作者:Jason Hongliu Wu、Guiru Zhang、Ned A. Porter
DOI:10.1016/s0040-4039(97)00295-5
日期:1997.3
transfer reactions of radicals substituted α to oxazolidinones. Similar selectivity patterns are observed for reactions in which such radicals are generated by addition to an acrylimide or by reactions in which the same radical is generated from the corresponding bromide. A good correlation is obtained for selectivity vs. the Taft steric parameter for the alkyl group attached to the radical center.