首次合成了两种具有天冬酰胺蛋白酶抑制活性的天然不饱和脂肪酸。通过分别使用布朗不对称烯丙基化或衍生自d-葡萄糖的手性结构单元来安装立体异构中心。经由HWE反应引入共轭二烯单元。通过C 6 D 6中的1 H NMR,C C双键的几何结构清楚地显示为(E)。。合成样品的光谱数据与相应天然样品的光谱数据具有极好的一致性。旋光度也与自然旋光度兼容。因此,可以将自然YF-0200RA和B的绝对配置分别可靠地指定为(8 S)和(8 S,10 S)。
首次合成了两种具有天冬酰胺蛋白酶抑制活性的天然不饱和脂肪酸。通过分别使用布朗不对称烯丙基化或衍生自d-葡萄糖的手性结构单元来安装立体异构中心。经由HWE反应引入共轭二烯单元。通过C 6 D 6中的1 H NMR,C C双键的几何结构清楚地显示为(E)。。合成样品的光谱数据与相应天然样品的光谱数据具有极好的一致性。旋光度也与自然旋光度兼容。因此,可以将自然YF-0200RA和B的绝对配置分别可靠地指定为(8 S)和(8 S,10 S)。
The first total synthesis of the potent RNA-polymerase inhibitor etnangien is described, which establishes unequivocally the relative and absolute configuration of this sensitive macrolide antibiotic. Key features of the expedient and modular synthesis include stereoselective substrate-controlled boron- and tin-mediated aldol couplings to set the characteristic sequences of methyl and hydroxyl bearing
A highlystereoselective joint total synthesis of the potent polyketide macrolide antibiotics etnangien and etnangien methyl ester was accomplished by a convergent strategy and proceeds in 23 steps (longest linear sequence). Notable synthetic features include a sequence of highlystereoselective substrate-controlled aldolreactions to set the characteristic assembly of methyl- and hydroxyl-bearing
Enantioselective synthesis of a potential 1,5-syn-polyol C1–C24 subunit of (−)-caylobolide A
作者:Dripta De Joarder、Michael P. Jennings
DOI:10.1016/j.tetlet.2013.08.062
日期:2013.10
The synthesis of a possible 1,5-syn-polyol C1–C24 subunit resident in (−)-caylobolide A has been accomplished. The key reaction sequence was a repetitive protocol for the construction of the syn-1,5-diol segment by means of Ru-catalyzedcross-metathesis and boron-mediated allylation reactions.