Synthesis and characterization of all four isomers of methyl 2,4-decadienoate for an investigation of the pheromone components of Pityogenes chaicographus
4-decadienoate (1), an important pheromone component of Pityogenes chalcographus, and its three geometrical isomers (2–4) have been synthesized and obtained in 99 % isomeric purity. Urea inclusion complexes were used in the final purification procedures. Spectroscopic data (MS, 1H and 13C NMR) of all four isomers are discussed. A photoisomerization study of the decadienoates is presented.
(2 E,4 Z)-2,4-癸二烯酸甲酯(1 E),Pityogenes chalcographus的重要信息素成分,及其三种几何异构体(2-4)均已合成,纯度为99%。在最终的纯化程序中使用了尿素包合物。讨论了所有四个异构体的光谱数据(MS,1 H和13 C NMR)。提出了癸二烯酸酯的光异构化研究。
New procedures for the selective synthesis of 2(2H)-pyranone derivatives and 3-aryl-4-iodoisocoumarins
5-Iodo-2(2H)-pyranone derivatives have been selectively synthesized by reaction of stereodefined methyl 2-en-4-ynoates with iodine in MeCN, CH2Cl2 or C6H6 at 20degreesC (Method C) or by treatment of these esters with ICl in CH2Cl2 at 20degreesC (Method B). Methods B and C proved also to be suitable for the preparation of 3-aryl-4-iodoisocoumarins from the corresponding methyl 2-(arylethynyl)benzoates. Interestingly, the high selectivity of iodolactonization of stereodefined methyl 2-en-4-ynoates by Method B allowed preparation in moderate yields of 2(2H)-pyranone derivatives by a one-pot sequence of iodolactonization and Stille-type reactions. (C) 2002 Elsevier Science Ltd. All rights reserved.
NORIN, TORBJORN;UNELIUS, C. RIKARD, ACTA CHEM. SCAND., 44,(1990) N, C. 106-107
作者:NORIN, TORBJORN、UNELIUS, C. RIKARD
DOI:——
日期:——
BACKSTROM, PETER;JACOBSSON, ULLA;NORIN, TORBJORN;UNELIUS, C. RIKARD, TETRAHEDRON, 44,(1988) N 9, 2541-2548
作者:BACKSTROM, PETER、JACOBSSON, ULLA、NORIN, TORBJORN、UNELIUS, C. RIKARD
DOI:——
日期:——
Norin, Torbjoern; Unelius, C. Rikard, Acta Chemica Scandinavica, 1990, vol. 44, # 1, p. 106 - 107