Enantioselective Total Syntheses of (<i>R</i>)- and (<i>S</i>)-Naphthotectone, and Stereochemical Assignment of the Natural Product
作者:Guillermo A. Guerrero-Vásquez、Flávia A. D. Galarza、José M. G. Molinillo、Carlos Kleber Z. Andrade、Francisco A. Macías
DOI:10.1002/ejoc.201501479
日期:2016.3
core of the final products was obtained by a late-stage anodic treatment. (R)-Naphthotectone was obtained in six steps from leuconaphthazarin with an overall yield of 38 % and an enantiomeric excess of 86 %. This compound was found to have the same absolute configuration as the natural product at its C-3′ stereogenic center. (S)-Naphthotectone was obtained in five steps from leuconaphthazarin with an
Total synthesis of (±)bicyclomycin was achieved in 19 steps starting from diketopyperazine.
从二酮哌嗪开始,在19个步骤中完成了(±)双环霉素的全合成。
Stereochemische Korrelationen zwischen (2<i>R</i>,4′<i>R</i>,8′<i>R</i>)-α-Tocopherol, (25<i>S</i>,26)-Dihydroxycholecalciferol, (-)-(1<i>S</i>,5<i>R</i>)-Frontalin und (-)-(<i>R</i>)-Linalol
作者:Richard Barner、Josef Hübscher
DOI:10.1002/hlca.19830660321
日期:1983.5.5
StereochemicalCorrelations between (2R,4′R,8′R)-α-Tocopherol, (25S,26)-Dihydroxycholecalciferol, (–)-(1S,5R)-Frontalin and (–)-(R)-Linalol
Synthesis and antimicrobial evaluation of bicyclomycin analogs
作者:Robert M. Williams、Robert W. Armstrong、Jen Sen Dung
DOI:10.1021/jm00383a008
日期:1985.6
p-methoxybenzyl, deprotection of the lipophilic amides with ceric ammonium nitrate affords the corresponding lipophobic free amides. The basic bicyclic nucleus of bicyclomycin (8h, R1 = R2 = R3 = R4 = H) has been synthesized for the first time as well as increasingly more complex congeners bearing the C-6 OH, 5-methylene; C-1'-C-3' trihydroxyisobutyl group. In general, it has been found that the bicyclic nucleus
Synthetic studies on bicyclomycin II synthesis of (±)-N,N′, O-trimethylbicyclomycin
作者:Shin-ichi Nakatsuka、Kumi Yoshida、Toshio Goto
DOI:10.1016/s0040-4039(01)92395-0
日期:1981.1
Stereospecific aldol condensation of at the bridge-head position with i-butyraldehyde gave and in a ratio of 4:1. Using the aldehyde the chiral centers were controlled to produce , in a ratio of 9:3:3:1. Deprotection of the major isomer afforded (±)-N,N′,O-trimethylbicyclomycin .