Enantioselective syntheses of two 5, 9E diastereomers of 223V, an alkaloid from the poison frog Dendrobates pumilio
作者:Naoki Toyooka、Hideo Nemoto、Masashi Kawasaki、H. Martin Garraffo、Thomas F. Spande、John W. Daly
DOI:10.1016/j.tet.2004.11.060
日期:2005.1
Enantioselective syntheses of two 5, 9E diastereomers (1 and 2) of 223V (3) are described. Neither corresponded on GC–MS and GC-FTIR analyses to alkaloid 223I, previously tentatively proposed to be a 5,8-disubstituted indolizidine of the unusual 5, 9E relative stereochemistry. Synthetic (−)-(5, 9Z)-5-n-propyl-8-n-butylindolizidine (3) corresponds on GC–MS and GC-FTIR analyses to the natural indolizidine
描述了223V(3)的两个5、9 E非对映异构体(1和2)的对映选择性合成。在GC-MS和GC-FTIR分析中,两者均不符合生物碱223I,先前曾尝试将其作为具有异常5,9 E相对立体化学的5,8-二取代的吲哚并立定。合成的( - ) - (5,9 Ž)-5- Ñ丙基-8- Ñ -butylindolizidine(3)上GC-MS和GC-FTIR分析对应于天然吲哚里223V在一发现pumilio从'拆分希尔,巴拿马。