Synthesis of enantiopure 1,2-dihydroxyhexahydropyrroloisoquinolines as potential tools for asymmetric catalysis
作者:Zbigniew Kałuża、Danuta Mostowicz
DOI:10.1016/s0957-4166(02)00785-1
日期:2003.1
stereocontrolled synthesis of enantiopure 1,2-dihydroxyhexahydropyrroloisoquinolines 2–4 and a formal synthesis of ent-2–4 starting from d-mannose and l-tartaric acid is reported. The strong tertiary amine bases 2–4 containing hydroxyl groups, able to activate electrophiles throughhydrogen bonding, are potentially useful as a catalysts in base-catalyzed processes as well as newligands in metal-based
Microbial oxidation of chloroaromatics in the enantiodivergent synthesis of pyrrolizidine alkaloids: trihydroxyheliotridanes
作者:Tomas Hudlicky、Hector Luna、John D. Price、Fan Rulin
DOI:10.1021/jo00302a037
日期:1990.7
A New Enantioselective Total Synthesis of AI-77-B
作者:Hiyoshizo Kotsuki、Tomohiro Araki、Aya Miyazaki、Mitsuhiro Iwasaki、Probal K. Datta
DOI:10.1021/ol990102y
日期:1999.8.1
[GRAPHICS]An enantioselective total synthesis of Al-77-B (1), a gastroprotective substance isolated from a culture broth of Bacillus pumilus Al- 77, was performed in high overall yield. In this synthesis, the dihydroisocoumarin part 14 and the dihydroxyamino acid part 20 were both assembled from D-ribose as the common chiral source, For the construction of 14 a bromobenzofuran derivative was used as a novel salicylic acid synthon. Finally, DEPC-mediated condensation of 14 and 20 yielded Al-77-B (1).
A New Concise Approach to the Enantioselective Synthesis of the Hydroxyamino Acid Moiety of AI-77-B
The hydroxyamino acid moiety of AI-77-B has been prepared from D-ribose in an optically pure form via stereoselective alkylation of N-acylpyrrolidinium ion intermediates as the key step.
ALI, SYED MASHHOOD;RAMESH, KAKARLA;BORCHARDT, RONALD T., TETRAHEDRON LETT., 31,(1990) N1, C. 1509-1512
作者:ALI, SYED MASHHOOD、RAMESH, KAKARLA、BORCHARDT, RONALD T.