Diastereoselectively Complementary C–H Functionalization Enables Access to Structurally and Stereochemically Diverse 2,6-Substituted Piperidines
作者:Gang Wang、Ying Mao、Lei Liu
DOI:10.1021/acs.orglett.6b03372
日期:2016.12.16
The preparation of 2,6-substituted piperidine derivatives through diastereoselective C–H functionalization of corresponding nitrogen heterocycles represents an appealing protocol and yet remains a formidable challenge. Here, we describe a stereochemically complementary oxidative C–H functionalization of N-carbamoyl tetrahydropyridines with a wide variety of building blocks, providing either the cis-
Conformation-induced regioselective and divergent opening of epoxides by fluoride: facile access to hydroxylated fluoro-piperidines
作者:Nan Yan、Zheng Fang、Qing-Quan Liu、Xiao-Hong Guo、Xiang-Guo Hu
DOI:10.1039/c6ob00063k
日期:——
2-aryl-piperidines can be ring-opened with the reagentcombination of tetrabutylammonium fluoride (TBAF) and potassium bifluoride (KHF2) in a regioselective and divergent fashion. Four different types of hydroxylated fluoro-piperidines, valuable building blocks in drug development, were readily synthesized using this method. The basic nature of the reagentcombination allowed a one-pot deprotection/ring opening
Regio- and Diastereoselective Cross-Dehydrogenative Coupling of Tetrahydropyridines with 1,3-Dicarbonyl Compounds
作者:Huan Long、Gang Wang、Ran Lu、Mengmeng Xu、Kelian Zhang、Shutao Qi、Yiheng He、Yuxiang Bu、Lei Liu
DOI:10.1021/acs.orglett.7b00787
日期:2017.4.21
A regio- and diastereoselective cross-dehydrogenative coupling of N-carbamoyl tetrahydropyridines with a variety of 1,3-dicarbonyl compounds is described. The method exhibits good functional group tolerance, diastereoselectively generating cis-2,6- or cis-2,4-substituted tetrahydropyridines by using different types of 1,3-dicarbonyls. Moreover, a two-step sequence involving diastereoselective cross-dehydrogenative