3,5-Didesoxy-3,5-di- C -methyl- L-idose-trimethylendithioacetal,ein chiraler Baustein zur Macrolidantibiotika-Synthese 1)
摘要:
Ein sehr kurzer Synthesewegfürdie Titelverbindung 43 aus 1,2;5,6-Di-O-isopropyliden-α-D-glucofuranose(II)wird aufgezeigt。Schlüsselreaktionena)可以在立体异构体中得到1,4-羟基锂二甲基环己酮和Zuckerenone混合物,然后在24原子和27原子下从碳原子团上脱除碳原子团,从呋喃糖体系中脱除L- konfigurierten 3-Desoxy-3- C-甲基苯并二酮)立体原子氢外循环中的氢原子甲基环戊烯5位原子对氨基苯甲酸乙酯12和42。在C-Atom 3zurückgeführt的替代品生产基地获得了Effekte奖。NachÜberführung在Pyranosesystem系统中的应用Substanzen durch 1 H-NMR-absichichert。
3-O-Benzyl-6-deoxy-1,2-O-isopropylidene-alpha -D-xylo-hexofuranos-5-ulose (I) and 3,6-dideoxy-1,2-O-isopropylidene-alpha -D-glycero-hex-3-enofuranos-5-ulose (6) reacted with carbon disulfide and methyl iodide under basic conditions to give the alpha -oxoketene-S,S-acetals 2 and 7, respectively. Treatment of 2 and 7 with hydrazine hydrate yielded the pyrazole derivatives 3 and 8, respectively.
Synthesis of a higly substituted cyclopentane: completely exo- and face-selective diels-alder reaction of cyclopentadiene with cyclic sugar dienophiles
作者:Kwan Soo Kim、Cho in Haeng、Joo Yung Hyup、Yoo In Young、Jung Hoon Song、Jun Hyung Ko
DOI:10.1016/0040-4039(92)88092-j
日期:1992.7
Diels-Alder reaction of cyclic sugar dienophiles with cyclopentadiene and cyclohexadiene occurred in totally exo- and face-selective manner to afford single stereoisomers, one of which wa tranformed into a highly substituted cyclopentane.