Aminonitrile and cyanohydrin ethers as benzoyl anion equivalents in conjugate additions to substituted α cyclenones : comparative synthetic potentialities
Lithiated aminonitrile and cyanohydrin ether are good nucleophilic benzoyl equivalents in conjugate addition to α cyclenones. is more sensitive to β substitution of the cyclenone than , as in THF it does not react with 3-methyl substituted cyclohexenones , . From 2-methyl and 2-fluorocyclenones and or , 2-subsyituted 3-benzoylcyclanones are stereoselectively obtained, provided that mild unmasking conditions
Efficient mercury-free preparation of vinyl and isopropenyl ethers of chiral secondary alcohols and α-hydroxyesters
作者:Gilles Dujardin、Sandrine Rossignol、Eric Brown
DOI:10.1016/0040-4039(95)00087-s
日期:1995.3
acetals 2a-h and 5a-d, readily deriving from the α-chiral alcohols 1a-h and ethyl vinylether or isopropenyl methyl ether, underwent selective elimination of primary alcohol upon treatment with triethylamine and trimethylsilyl trifluoromethanesulfonate, and thus afforded good to high yields of the chiral enol ethers 3a-h and 6a-d, respectively.
Simple Synthesis of Aryl <i>p</i>
-Nitroarylacetonitriles by Vicarious Nucleophilic Substitution with Carbanions of Protected Cyanohydrins
作者:Nazar Rad、Mieczysław Mąkosza
DOI:10.1002/ejoc.201701507
日期:2018.1.23
Cyanohydrins were protected as acetals and successfully used in the vicariousnucleophilic substitution of the hydrogen atom of aromaticnitrocompounds to give p‐nitro‐substituted diarylacetonitriles.
electrophilic nature of quinoxaline has been explored in the vicarious nucleophilic substitution (VNS) of hydrogen with various carbanions as nucleophiles in an attempt to develop a general method for functionalizing the heterocyclic ring. Only poorly stabilized nitrile carbanions were found to give the VNS products. 2-Chloroquinoxaline gave products of SNAr of chlorine preferentially. A variety of quinoxaline
喹喔啉的亲电性质已在氢与各种碳负离子作为亲核试剂的替代亲核取代 (VNS) 中进行了探索,以试图开发一种使杂环功能化的通用方法。只有不稳定的腈碳负离子被发现能提供 VNS 产品。2-氯喹喔啉优先生成氯的S N Ar产物。在与喹喔啉N-氧化物的 VNS 反应中,已经制备了多种含有氰基烷基、磺酰烷基、苄基或酯取代基(包括氟化的)的喹喔啉衍生物。
Munoz, A. Heber; Tamariz, Joaquin; Jimenez, Rogelio, Journal of Chemical Research, Miniprint, 1993, # 2, p. 501 - 522
作者:Munoz, A. Heber、Tamariz, Joaquin、Jimenez, Rogelio、Mora, Gustavo Garcia de la