作者:Xiaojun Zeng、Wenhao Yan、Samson B. Zacate、Tzu-Hsuan Chao、Xiaodong Sun、Zhi Cao、Kate G. E. Bradford、Matthew Paeth、Sam B. Tyndall、Kundi Yang、Tung-Chun Kuo、Mu-Jeng Cheng、Wei Liu
DOI:10.1021/jacs.9b05363
日期:2019.7.24
We report herein a highly efficient Cu-catalyzed protocol for the conversion of aliphatic carboxylic acids to the corresponding difluoromethylated analogues. This robust, operationally simple and scalable protocol tolerates a variety of functional groups and can convert a diverse array of acid-containing complex molecules to the alkyl-CF2H products. Mechanistic studies support the involvement of alkyl
Engaging Alkenes and Alkynes in Deaminative Alkyl–Alkyl and Alkyl–Vinyl Cross-Couplings of Alkylpyridinium Salts
作者:Kristen M. Baker、Diana Lucas Baca、Shane Plunkett、Mitchell E. Daneker、Mary P. Watson
DOI:10.1021/acs.orglett.9b03899
日期:2019.12.6
An alkyl-alkyl cross-coupling of Katritzky alkylpyridinium salts and organoboranes, formed in situ via hydroboration of alkenes, has been developed. This method utilizes the abundance of both alkyl amine precursors and alkenes to form C(sp3)-C(sp3) bonds. This strategy is also effective with alkynes, enabling a C(sp3)-C(sp2) cross-coupling. Under these mild conditions, a broad range of functional groups
Deaminative Reductive Cross-Electrophile Couplings of Alkylpyridinium Salts and Aryl Bromides
作者:Jennie Liao、Corey H. Basch、Megan E. Hoerrner、Michael R. Talley、Brian P. Boscoe、Joseph W. Tucker、Michelle R. Garnsey、Mary P. Watson
DOI:10.1021/acs.orglett.9b01014
日期:2019.4.19
A nickel-catalyzed reductive cross-coupling of alkylpyridinium salts and aryl bromides has been developed using Mn as the reductant. Both primary and secondary alkylpyridinium salts can be used, and high functional group and heterocycle tolerance is observed, including for protic groups. Mechanistic studies indicate the formation of an alkyl radical, and controlling its fate was key to the success
Harnessing Alkylpyridinium Salts as Electrophiles in Deaminative Alkyl–Alkyl Cross-Couplings
作者:Shane Plunkett、Corey H. Basch、Samantha O. Santana、Mary P. Watson
DOI:10.1021/jacs.9b00111
日期:2019.2.13
A Negishicross-coupling of alkylpyridinium salts and alkylzinc halides has been developed. This is the first example of alkyl-alkyl bond formation via cross-coupling of an alkyl amine derivative with an unactivated alkyl group, and allows both primary and secondary alkylpyridinium salts to react with primary alkylzinc halides with high functional group tolerance. When combined with formation of the
Three Sequential C–N Bond Formations: <i>tert</i>-Butyl Nitrite as a N1 Synthon in a Three Component Reaction Leading to Imidazo[1,2-<i>a</i>]quinolines and Imidazo[2,1-<i>a</i>]isoquinolines
作者:Prasenjit Sau、Amitava Rakshit、Anju Modi、Ahalya Behera、Bhisma K. Patel
DOI:10.1021/acs.joc.7b02815
日期:2018.1.19
dual role of an oxidant as well as a N1 synthon in a multicomponent reaction involving quinolines, isoquinolines, and styrenes. Herein, two sp2 C–H functionalizations of styrenes and one sp2 C–H functionalization of quinolines and isoquinolines lead to the formation of fused quinolines and isoquinolines via three sequential C–N bond formations.