(±)-2,3,5-trichloro-4,4-ethylenedioxycyclopent-2-en-1-one and its 5-allyl-substituted derivative in conjugated 1,4-addition with dimethyldilithium cyanocuprate
作者:R. R. Akhmetvaleev、N. A. Ivanova、L. R. Imaeva、T. A. Belogaeva、A. M. Shainurova、M. S. Miftakhov
DOI:10.1007/bf02503779
日期:1997.11
(+/-)-2,3,5-Trichloro-4,4-ethylenedioxycyclopent reacts with Me2CuCNLi2 to give depending on conditions the corresponding 3-methyl substituted cyclopentenone (Ad(N)E adduct) or a mixture of unsaturated acyclic acids formed as the result of abnormal cleavage reaction of C(1)-C(2) bond in the trichorocyclopentenone. Reactions of conjugated 1,4-addition of Me2CuCNLi2 to (+/-)-5-allyl-2,3,5-trichloto-4,4-dimethoxycyclopent 1-one lead to products of replacement of vinylic Cl atom at C(3) by Me group and those of C(5)-dechlorination.
(+/−)-2,3,5-三氯-4,4-亚乙基二氧环戊烷与 Me₂CuCNLi₂ 反应,在不同条件下生成相应的 3-甲基取代的环戊烯酮(Ad(N)E 加成物),或由三氯环戊烯酮中 C(1)-C(2)键异常断裂反应生成的不饱和脂肪酸混合物。Me₂CuCNLi₂ 对 (+/−)-5-烯丙基-2,3,5-三氯-4,4-二甲氧基环戊酮-1 的共轭 1,4-加成反应,导致 C(3)位的乙烯基氯原子被甲基取代以及 C(5)位的脱氯产物生成。