期刊
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
卷 2017, 期 26, 页码 3874-3885出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201700399
关键词
Amino alcohols; Enantioselectivity; Aldol reactions; Organocatalysis; Total synthesis
资金
- Adaptable & Seamless Technology Transfer Program through Target-driven R&D from the Japan Science and Technology Agency (JST) [AS231Z01382G, AS221Z01186D]
Enantioselective crossed aldol reactions of isatin derivatives and acetaldehyde have been developed with a series of simple diamino alcohol catalysts to afford 3-substituted 3-hydroxyindolin- 2-ones in high chemical yields (up to 95 %) and optical purities (up to 92 % ee). The synthetic potential of the present protocol has been demonstrated by concise, enantioselective, protecting-group-free, and transition metal-free total syntheses of antitumor and antiviral agents with the tryptanthrin architecture, that is, phaitanthrin B and cephalanthrin A, along with the biologically active indolidine alkaloids chimonamidine and donaxaridine as well as the formal synthesis of CPC-1. The highly enantioselective outcome of this catalytic crossed aldol reaction was evaluated by calculating the Gibbs free energies of the possible transition states.
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