A Convergent Three-Component Total Synthesis of the Powerful Immunosuppressant (−)-Sanglifehrin A
作者:Leo A. Paquette、Maosheng Duan、Ingo Konetzki、Christoph Kempmann
DOI:10.1021/ja020091v
日期:2002.4.1
The potent immunosuppressive agent (-)-sanglifehrin A (5), initially discovered in a soil sample from Malawi, has been synthesized in a highly convergent and stereocontrolled manner. The enantioselective approach relies on initial construction of the iodovinyl carboxylic acid 14, which is coupled to tripeptide 59 in advance of a key macrolactonization step that generates 61a. An alternative protocol
Syntheses of 20'-deoxyvinblastine, 20'-deoxyleurosidine, 20'-deoxyvincovaline, 20'-epi-20'-deoxyvincovaline, and 20'-deoxyvincristine and its 20'-epimer through racemic and enantioselectively generated intermediates. New syntheses of D/E-cis- and trans-.PSI.-vincadifformines and D/E-cis- and -trans-20-epi-.PSI.-vincadifformines
作者:Martin E. Kuehne、William G. Bornmann
DOI:10.1021/jo00275a029
日期:1989.7
Synthesis of the tripeptide (C1–N12) and hydroxylated hexadecene (C26–C41) domains of sanglifehrin A and C
作者:Leo A. Paquette、Ingo Konetzki、Maosheng Duan
DOI:10.1016/s0040-4039(99)01539-7
日期:1999.10
Fully enantio-controlled routes to two major segments of the newly discovered immunosuppressants sanglifehrin A and C are described. (C) 1999 Elsevier Science Ltd. All rights reserved.
KUEHNE, MARTIN E.;BORNMANN, WILLIAM G., J. ORG. CHEM., 54,(1989) N4, C. 3407-3420
作者:KUEHNE, MARTIN E.、BORNMANN, WILLIAM G.
DOI:——
日期:——
Asymmetric Synthesis of (−)-Eburnamonine and (+)-<i>e</i><i>pi</i>-Eburnamonine from (4<i>S</i>)-4-Ethyl-4-[2-(hydroxycarbonyl)ethyl]-2-butyrolactone
作者:Andrew G. H. Wee、Qing Yu
DOI:10.1021/jo010751z
日期:2001.12.1
The key chiral nonracemic 4,4-disubstituted 2-butyrolactone carboxylic acid, (S)-4, is readily accessible via an efficient and stereospecific dirhodium(II) tetraacetate catalyzed tertiary C-H insertion reaction of the diazomalonate (S)-5. The coupling of the acid (S)-4 with tryptamine produces the amide (S)-3, which is then transformed into the aldehyde 23 and hydroxy-lactam 24. Acid-mediated Pictet-Spengler