A Brønsted Acid Catalyzed Cascade Reaction for the Conversion of Indoles to α‐(3‐Indolyl) Ketones by Using 2‐Benzyloxy Aldehydes
作者:Ankush Banerjee、Modhu Sudan Maji
DOI:10.1002/chem.201902268
日期:2019.9.2
A Brønstedacid catalyzed, operationally simple, scalable route to several functionalized α-(3-indolyl) ketones has been developed and the long-standing regioisomeric issue has been eliminated by choosing appropriate carbonyls. A readily available and cheap bottle reagent was used as the catalyst. This protocol was also applicable to the synthesis of densely functionalized α-(3-pyrrolyl) ketones. A
[EN] SYNTHESIS OF CYCLODEPSIPEPTIDE COMPOUNDS HAVING ANTINEOPLASTIC AND/OR ANTIMICROBIAL ACTIVITY<br/>[FR] SYNTHÈSE DE COMPOSÉS CYCLODEPSIPEPTIDE AYANT UNE ACTIVITÉ ANTINÉOPLASIQUE ET/OU ANTIMICROBIENNE
申请人:UNIV ARIZONA
公开号:WO2008151306A1
公开(公告)日:2008-12-11
[EN] The present invention is directed to effective methods of synthesizing cyclodepsipeptide compounds having antineoplastic and/or antimicrobial activity. Total syntheses of the eighteen-membered ring cyclodepsipeptides kitastatin (1a) and respirantin (1b) are taught. One important step in the synthesis is an intramolecular transesterification of the ?-ketoester alcohol 6 to afford the protected macrocycle 5. The synthetic products were shown to be identical to the natural products and the absolute stereochemistry of 6 of the 7 asymmetric centers of cyclodepsipeptide 1b was unequivocally established. Kitastatin (1a) and respirantin (1b) were found to be remarkable inhibitors of cancer cell growth and are related to the antimycin family of antibiotics. [FR] La présente invention concerne des procédés efficaces de synthèse de composés cyclodepsipeptide ayant une activité antinéoplasique et/ou antimicrobienne. Les synthèses totales des cyclodepsipeptides cycliques à dix-huit chaînons kitastatine (1a) et respirantine (1b) sont apprises. Une étape importante de la synthèse est une transestérification intramoléculaire de l'alcool cétoester 6 pour permettre le macrocycle protégé 5. Les produits de synthèse se sont avérés être identiques aux produits naturels et la stéréochimie absolue de 6 des 7 centres asymétriques de cyclodepsipeptide 1b a été établie de manière univoque. La kitatastine (1a) et la respirantine (1b) se sont avérées être des inhibiteurs remarquables de la croissance de cellules cancérigènes et sont liées à la famille antimycine d'antibiotiques.
Antineoplastic Agents. 561. Total Synthesis of Respirantin<sup>1a</sup>
作者:George R. Pettit、Thomas H. Smith、Song Feng、John C. Knight、Rui Tan、Robin K. Pettit、Peter A. Hinrichs
DOI:10.1021/np0680735
日期:2007.7.1
Totalsynthesis of the 18-membered ring cyclodepsipeptide believed to be respirantin (1b) has been achieved. The key step in the synthesis is an intramolecular transesterification of the beta-ketoester alcohol 6 to afford the protected macrocycle 5. The synthetic product was shown to be identical to a natural product presumed to be respirantin (1b), and the absolute stereochemistry of six of the seven