Hydrogenation is only the beginning: alkyl groups are mildly transferred from alkyl substituted Hantzsch esters to replace the nitro groups of nitro olefins to providetrans-olefins in moderate to excellent yields.
Introduction of alkyl groups on azodicarboxylate esters is an important method to prepare alkyl aminederivatives. Herein, we report reactions of 4-alkyl-1,4-dihydropyridines as alkylation reagents with di-tert-butyl azodicarboxylate to prepare alkyl aminederivatives under heating conditions. The alkylation reactions via C–C bond cleavage of the dihydropyridines are achieved in the absence of catalysts
Photocatalytic Three-Component Umpolung Synthesis of 1,3-Diamines
作者:Thomas Rossolini、Jamie A. Leitch、Rachel Grainger、Darren J. Dixon
DOI:10.1021/acs.orglett.8b02923
日期:2018.11.2
visible-light-mediated photocatalytic umpolung synthesis of 1,3-diamines from in situ-generated imines and dehydroalanine derivatives is described. Pivoting on a key nucleophilic addition of photocatalytically generated α-amino radicals to electron-deficient alkenes, this three-component coupling reaction affords 1,3-diamines efficiently and diastereoselectively. The mild protocol tolerates a wide variety
Hydrogenation was only the beginning: Hantzsch esters have now been used to transferalkyl groups to imines under mild catalytic conditions to provide a variety of amines (see scheme). Benzyl, secondary alkyl, and tertiary alkyl groups containing ether, ester, and hydroxy functionalities were transferred successfully. The use of Hantzsch esters as alkylation reagents offers a practical and complementary
Application of Hantzsch Ester and Meyer Nitrile in Radical Alkynylation Reactions
作者:Xu Liu、Ruoyu Liu、Jie Dai、Xu Cheng、Guigen Li
DOI:10.1021/acs.orglett.8b03050
日期:2018.11.2
constructing a Csp3–Csp bond with substituted Hantzsch ester and Meyer nitrile is reported. When benziodoxole-activated alkyne was applied as the alkynyl donor, products containing Csp3–Csp bonds involving primary, secondary, and tertiary carbon centers were achieved in up to 97% yields. K2S2O8 was the optimum radical initiator in this reaction.
报道了用取代的Hantzsch酯和Meyer腈构建C sp3- C sp键的第一个例子。当使用苯并恶唑活化的炔烃作为炔基供体时,含有C sp3- C sp键的伯,仲和叔碳中心的产品收率高达97%。在该反应中,K 2 S 2 O 8是最佳的自由基引发剂。