A dramatic effect of double bond configuration in N-oxy-3-aza Cope rearrangements—a simple synthesis of functionalised allenes
作者:Luis F.V. Pinto、Paulo M.C. Glória、Mário J.S. Gomes、Henry S. Rzepa、Sundaresan Prabhakar、Ana M. Lobo
DOI:10.1016/j.tetlet.2009.02.228
日期:2009.7
The first examples of low temperature N-oxy-3-aza Cope rearrangements, leading to functionalised allenes are described, where the Z-configuration of the enaminic double bond in the rearranging system proves critical.
A new aralkyloxyamine derivative of general formula (I), which has an excellent herbicidal activity and is useful as a herbicide for controlling weeds growing in both paddy and upland fields, wherein A represents alkylene and R represents hydrogen, lower alkyl, lower alkenyl, lower alkynyl, cycloalkyl, lower alkoxy-lower alkyl, lower alkylthio-lower alkyl, lower alkoxycarbonyl-lower alkyl, cyano-lower alkyl, lower alkylcarbonyl-lower alkyl, or phenyl-lower alkyl.
original bifunctional platforms for the domino conjugate addition inverse-electron-demandhetero-Diels–Alder/retro-Diels–Alder (ihDA/rDA) reaction, was achieved using the highly acidic triflimide as an organocatalyst. Based on the use of alkoxyamine nucleophiles, this sequence not only highlights a rare example of the catalytic aza-Michael reaction to alkenylazaarenes but also proves to be useful for the elaboration
空前的催化氮杂-迈克尔加成反应,取代了3-乙烯基-1,2,4-三嗪,作为多米诺共轭物加成反应的反向双电子平台,反电子需求异Diels–Alder / RetroDiels–Alder(ih DA /使用高度酸性的三氟甲酰亚胺作为有机催化剂可实现r DA)反应。基于烷氧基胺亲核试剂的使用,该序列不仅突出了催化氮杂-迈克尔与链烯基氮杂芳烃反应的罕见实例,而且还证明可用于制备一系列与生物有关的四氢-[1,6]-萘啶。
Polarity-Mismatched Addition of Electrophilic Carbon Radicals to an Electron-Deficient Acceptor: Cascade Radical Addition–Cyclization–Trapping Reaction
in the case of substrates 2–7, perfluoroalkyl radicals selectively added to an electron-deficient alkene moiety of 2–7, to give polarity-mismatched perfluoroalkylation products without the formation of regioisomers. Next, the control of enantioselectivity was studied. In the case of substrates 1 and 3, the reaction proceeded with good enantioselectivities by employing a chiral Lewis acid, prepared from