Ethyl 2-oxo-1-(2-oxopropyl)-1-cyclopentanecarboxylate, on treatment with tBuOH-tBuOK at rt (1h), affords unusual ring expansion products ethyl 3,5-dioxo-1-cyclooctanecarboxylate, ethyl 4-acetyl-3-oxo-1-cyclohexanecarboxylate and ethyl 2-acetyl-3-oxo-1-cyclohexanecarboxylate in 19, 40 and 12% yields, respectively.
Nitroalkanes as Alkyl Anion Synthons — A New Approach to the Synthesis of 2-SubstitutedN-Ethyl Succinimides and 2-Substituted Succinate Diesters via Nitroalkanes
作者:Roberto Ballini、Giovanna Bosica
DOI:10.1002/jlac.199619961221
日期:1996.12
2-substituted succinate diesters were obtained by two key steps: (i) Michael addition of a nitroalkane to the appropriate enedione derivative under basic conditions (DBU), with the concomitant elimination of nitrous acid, and (ii) selective reduction of the obtained enone with nickelboride, in methanol/THF. In this context the nirtoalkane acts as an alkyl anion synthon. By this method trimethyl tricarboxylates
Synergistic control over the SH2 transition states of hydrogenabstraction exploiting polar and steric effects provides a promising cooperative strategy for site‐selective C(sp3)−H functionalization using decatungstate anion photocatalysis. By using this photocatalytic approach, the C−H bonds of substituted lactones and cyclic ketones were functionalized selectively. In the remarkable case of 2‐isoamyl
利用极性和空间效应对氢提取的S H 2过渡态进行协同控制,为利用去阳离子化阴离子光催化的位点选择性C(sp 3)-H功能化提供了一种有前途的合作策略。通过使用这种光催化方法,取代的内酯和环状酮的CH键被选择性地官能化。在带有5个甲基,5个亚甲基和3个次甲基CH键的2-异戊基4-叔丁基环己酮(1 t)的显着情况下,异戊基绳索中的1个次甲基CH键被选择性地官能化。
Addition of ?-Carboxyalkyl radicals to olefins, synthesis of DI- and trigarboxylic acids