Hexulose Derivatives and Lipase-Mediated Diastereomeric Resolution in the Enantiospecific Total Synthesis of (−)-Talaromycins C and E
作者:Isidoro Izquierdo、María T. Plaza、Miguel Rodríguez、Juan A. Tamayo
DOI:10.1002/1099-0690(20021)2002:2<309::aid-ejoc309>3.0.co;2-v
日期:2002.1
Diastereomeric enzymatic (Chirazyme® L-2, c.−f., C2) resolution of 3-C-acetoxymethyl-1,2,3,4,5-pentadeoxy-6,7:8,9-di-O-isopropylidene-β-D-gluco- and -D-manno-dec-6-ulo-6,10-pyranose (6), obtained from “diacetone D-fructose aldehyde” (3) and the corresponding phosphorane from (3-benzyloxy-2-ethylpropyl)triphenylphosphonium iodide (2), has enabled us to synthesize spiroketals (3R,4S,5S,6R,9R)- and (3R
3-C-乙酰氧基甲基-1,2,3,4,5-pentadeoxy-6,7:8,9-di-O-isopropylidene的非对映异构酶(Chirazyme® L-2, c.−f., C2)拆分-β-D-葡萄糖-和-D-甘露糖-dec-6-ulo-6,10-吡喃糖(6),从“双丙酮D-果糖醛”(3)和相应的正膦(3-苄氧基- 2-乙基丙基)三苯基碘化鏻 (2),使我们能够合成螺缩酮 (3R,4S,5S,6R,9R)- 和 (3R,4S,5S,6R,9S)-9-乙基-3,4-isopropylidenedidedioxy -1,7-二氧杂螺[5.5]十一烷(7和8)。将 8 转化为 (-)-talaromycins G 和 9-epi-A 的尝试未成功。然而,(-)-talaromycins C 和 E 可以通过十二个步骤从 spiroketal 7 对映特异性制备。