Synthesis of (2E,6E)-[10-3H]farnesol and (2E6E)-[10-3H]farnesal for insect dehydrogenase studies
作者:Stephanie E. Sen、Gail M. Garvin
DOI:10.1002/jlcr.2580361106
日期:1995.11
[10-3H]Farnesol ((2E,6E)-3,7,11-trimethyl-2,6,10-dodecatrien-1-ol) and [10-3H]farnesal ((2E,6E)-3,7,11-trimethyl-2,6,10-dodecatrien-1-al) were synthesized by sequential reduction and oxidation of the corresponding tert-butyldiphenylsilyl protected 11,12,13-trisnoraldehyde, followed by Wittig homologation using isopropyltriphenylphosphorane. Direct reduction of the C-12 allylic bromide or allylic chloride proved to be an nonviable method, resulting in either multiple decomposition products or significant double bond transposition. Oxidation of the [10-3H]labelled trisnoralcohol with pyridinium chlorochromate resulted in essentially complete retention of the radiolabel as was established for the corresponding deuterated material. [3H]labelled farnesol and farnesal were obtained in 78% and 74% yields, respectively, from the trisnoraldehyde. These materials were used as radiotracers for examining the enzymatic activity of insect farnesol and farnesal dehydrogenase, key enzymes in the biosynthesis of juvenile hormone.
[10-3H]法尼醇((2E,6E)-3,7,11-三甲基-2,6,10-十二烯-1-醇)和[10-3H]法尼醛((2E,6E)-3,7,11-三甲基-2,6,10-十二烯-1-醛)是通过相应的tert-丁基二苯基硅基保护的11,12,13-三诺醛的连续还原和氧化合成的,随后使用异丙基三苯基膦进行Wittig同 homologation。直接还原C-12的烯丙基溴化物或烯丙基氯化物被证明是一种不可行的方法,导致产生多种分解产物或显著的双键转位。用吡啶氯铬酸对[10-3H]标记的三诺醇进行氧化,几乎完全保留了放射性标记,这一点在相应的重氘化物中得到了证实。[3H]标记的法尼醇和法尼醛分别以78%和74%的产率从三诺醛中获得。这些材料被用作放射性示踪剂,以检验昆虫法尼醇和法尼醛脱氢酶的酶活性,后者是幼激素生物合成中的关键酶。