Tandem Intramolecular Carbolithiation-Lithium/Zinc Transmetallation and Applications to Carbon−Carbon Bond-Forming Reactions
作者:Miguel Yus、Rosa Ortiz
DOI:10.1002/ejoc.200400349
日期:2004.9
Lithium/zinc transmetallation with the cyclic organolithium intermediate 3 (prepared by intramolecular carbolithiation of the initially formed organolithium 2) gives the corresponding organozinc intermediate 5. Copper- or palladium-promoted SN2′ reactions between compound 5 and allylic or propargylic halides, as well as arylation, vinylation, benzylation, acylation, and conjugate addition to α,β-unsaturated
Enantioselective Alkylation of 2-Alkylpyridines Controlled by Organolithium Aggregation
作者:Joshua J. Gladfelder、Santanu Ghosh、Maša Podunavac、Andrew W. Cook、Yun Ma、Ryan A. Woltornist、Ivan Keresztes、Trevor W. Hayton、David B. Collum、Armen Zakarian
DOI:10.1021/jacs.9b08659
日期:2019.9.25
pyridines provides access to chiral pyridines via an opera- tionally simple protocol that obviates the need for prefunc- tionalization or preactivation of the substrate. The alkylation is accomplished using chiral lithium amides as non-covalent stereodirecting auxiliaries. Crystallographic and solution NMR studies provide insight into the structure of well- defined chiral aggregates in which a lithium
Palladium-Catalyzed Remote Hydrosulfonamidation of Alkenes: Access to Primary N-Alkyl Sulfamides by the SuFEx Reaction
作者:Chuanqi Hou、Zhenye Liu、Lan Gan、Wenzheng Fan、Lin Huang、Pinhong Chen、Zheng Huang、Guosheng Liu
DOI:10.1021/jacs.4c03283
日期:2024.5.15
HSA reaction of terminal alkenes and the remote HSA of internal alkenes are achieved to efficiently yield primary N-alkyl-N-(fluorosulfonyl)-carbamates. In addition, this protocol enables the high-value utilization of alkane by combining the dehydrogenation process. The generated N-alkyl products exhibit a unique reactivity of sulfur(VI) fluorides, which can be directly transferred to N-alkyl sulfamides
Borane‐Catalyzed Asymmetric Reduction of 2‐Alkylpyridines†
作者:Heng Luo、Zhao‐Ying Yang、Ming Zhang、Xiao‐Chen Wang
DOI:10.1002/cjoc.202400671
日期:2024.12
Herein, a method for the enantioselective reduction of unprotected 2-alkylpyridines is reported for the first time. By using pinacolborane and an amide as reducing agents, a large number of 2-alkylpiperidines were synthesized with high yields and excellent enantioselectivities via a cascade process involving 1,4-hydroboration and subsequent transfer hydrogenation. The resulting products can be easily