Stereoselective Synthesis of Trifluoro- and Monofluoro-Analogues of Frontalin and Evaluation of Their Biological Activity
作者:Paolo Ambrosi、Alberto Arnone、Pierfrancesco Bravo、Luca Bruché、Antonio De Cristofaro、Valeria Francardi、Massimo Frigerio、Enzo Gatti、Giacinto S. Germinara、Walter Panzeri、Fabrizio Pennacchio、Cristina Pesenti、Giuseppe Rotundo、Pio F. Roversi、Cristina Salvadori、Fiorenza Viani、Matteo Zanda
DOI:10.1021/jo0055640
日期:2001.12.1
stereoselective synthesis of both enantiomers of trifluoro frontalin (-)-(1S,5R)- and (+)-(1R,5S)-8, as well as of diastereomeric monofluoro frontalines (-)-(1R,2R,5R)-18 and (-)-(1R,2S,5R)-20, analogues of the bioactive component of the aggregation pheromone of the Scolytidae insect family, has been accomplished starting from (-)-(1R)- and (+)-(1S)-menthyl (S)-toluene-4-sulfinate as a source of chirality and
立体选择性合成三氟额叶蛋白(-)-(1S,5R)-和(+)-(1R,5S)-8的对映异构体以及非对映体单氟额叶碱(-)-(1R,2R,5R) -18和(-)-(1R,2S,5R)-20是鞘翅目昆虫家族聚集信息素生物活性成分的类似物,从(-)-(1R)-和(+)- (1S)-薄荷基(S)-甲苯-4-亚磺酸盐作为手性来源,三氟乙酸甲酯或氟乙酸甲酯分别作为氟来源。C-1立体中心是通过重氮甲烷将β-亚磺酰基酮2和13进行立体选择性环氧化而安装的。双环核是通过完全立体控制和化学选择性串联的Wacker氧化/中间不饱和亚磺酰基二醇5、15和19的分子内缩酮化而获得的。在实验室测试中,轴向氟化(-)-20引发了对Dendroctonus micans雌性女性的强电响应,而赤道氟化(-)-18和三氟类似物(-)-8则显示了适度的响应。由于(D)micans局部稀少,使用(-)-20进行的田间试验没有指示性,但对其他鞘翅目科显示出一定的吸引力。