Synthesis of 6- and 7-Membered Cyclic Enaminones: Scope and Mechanism
摘要:
Six- and seven-membered cyclic enaminones can be prepared using common. environmentally benign reagents. Ammo acids are used as synthetic precursors allowing diversification and the incorporation of chirality The key reaction in this multistep process involves deprotection Boc-amino ynones and subsequent treatment with methanolic K2CO3 to induce cyclization. A beta-amino elimination side reaction was identified in a few labile substrates that led to loss of stereochemical purity of degradation. This process can be mitigated in specific cases using mild deprotection conditions NMR and deuteitum-labeling experiments provided valuable insight into the work kings and limitations of this reaction Although disguised as a 6-endo-dig cyclization, the reagents employed in the transformation play a direct role in bond-making and bond-breaking. thus changing die mode of addition to a 6-endo-trig cyclization This method can be used to construct an array of monocyclic and bicyclic scaffolds. many of which me found in well-known natural products (e g indolizidine, quinolizidine, and Stemona alkaloids).
Synthesis of 6- and 7-Membered Cyclic Enaminones: Scope and Mechanism
摘要:
Six- and seven-membered cyclic enaminones can be prepared using common. environmentally benign reagents. Ammo acids are used as synthetic precursors allowing diversification and the incorporation of chirality The key reaction in this multistep process involves deprotection Boc-amino ynones and subsequent treatment with methanolic K2CO3 to induce cyclization. A beta-amino elimination side reaction was identified in a few labile substrates that led to loss of stereochemical purity of degradation. This process can be mitigated in specific cases using mild deprotection conditions NMR and deuteitum-labeling experiments provided valuable insight into the work kings and limitations of this reaction Although disguised as a 6-endo-dig cyclization, the reagents employed in the transformation play a direct role in bond-making and bond-breaking. thus changing die mode of addition to a 6-endo-trig cyclization This method can be used to construct an array of monocyclic and bicyclic scaffolds. many of which me found in well-known natural products (e g indolizidine, quinolizidine, and Stemona alkaloids).
BRANCHED CHAIN AMINO ACID-DEPENDENT AMINOTRANSFERASE INHIBITORS AND THEIR USE IN THE TREATMENT OF DIABETIC RETINOPATHY
申请人:Warner-Lambert Company LLC
公开号:EP1157000B1
公开(公告)日:2005-11-02
[EN] BRANCHED CHAIN AMINO ACID-DEPENDENT AMINOTRANSFERASE INHIBITORS AND THEIR USE IN THE TREATMENT OF DIABETIC RETINOPATHY<br/>[FR] INHIBITEURS D'AMINOTRANSFERASE ACIDES AMINES-DEPENDANTE A CHAINE RAMIFIEE, ET LEUR UTILISATION DANS LE CADRE DU TRAITEMENT DE LA RETINOPATHIE DIABETIQUE
申请人:WARNER LAMBERT CO
公开号:WO2001042191A1
公开(公告)日:2001-06-14
The present invention is directed to a method for the prophylactic and therapeutic treatment of diabetic retinopathy. The method involves the administration of an inhibitor of formulae (I), (II) and (III) of the branch chain amino acid-dependent aminotransferase (BCAT) pathway to an animal, such as a mammal, in particular a human, in an amount sufficient to treat the retina for diabetic retinopathy prophylactically or therapeutically. The present invention is also directed to several novel inhibitors of formula (IV) of the BCAT pathway. In formulae (I-IV), n, m, X and R1-R13 have the meanings given in the description.
Synthesis of 6- and 7-Membered Cyclic Enaminones: Scope and Mechanism
作者:Micah J. Niphakis、Brandon J. Turunen、Gunda I. Georg
DOI:10.1021/jo100907u
日期:2010.10.15
Six- and seven-membered cyclic enaminones can be prepared using common. environmentally benign reagents. Ammo acids are used as synthetic precursors allowing diversification and the incorporation of chirality The key reaction in this multistep process involves deprotection Boc-amino ynones and subsequent treatment with methanolic K2CO3 to induce cyclization. A beta-amino elimination side reaction was identified in a few labile substrates that led to loss of stereochemical purity of degradation. This process can be mitigated in specific cases using mild deprotection conditions NMR and deuteitum-labeling experiments provided valuable insight into the work kings and limitations of this reaction Although disguised as a 6-endo-dig cyclization, the reagents employed in the transformation play a direct role in bond-making and bond-breaking. thus changing die mode of addition to a 6-endo-trig cyclization This method can be used to construct an array of monocyclic and bicyclic scaffolds. many of which me found in well-known natural products (e g indolizidine, quinolizidine, and Stemona alkaloids).