Silver-Catalyzed Activation of Pyridotriazoles for Formal Intramolecular Carbene Insertion into Vinylic C(sp<sup>2</sup>)–H Bonds
作者:Haili Wang、Shaokun Cai、Wenna Ai、Xiufang Xu、Bin Li、Baiquan Wang
DOI:10.1021/acs.orglett.0c02586
日期:2020.9.18
A silver-catalyzed intramolecular denitrogenative annulation of pyridotriazole with alkene was reported to achieve the challenging carbene insertion into the vinylic C(sp2)–H bond. This protocol has enabled the construction of functionalized 1H-indenes with high efficiency and excellent functional group tolerance. Experimental and computational studies suggest a stepwise mechanism involving a water-promoted
Dearomative Migratory Rearrangement of 2-Oxypyridines Enabled by α-Imino Rhodium Carbene
作者:Guangyang Xu、Ying Shao、Shengbiao Tang、Qun Chen、Jiangtao Sun
DOI:10.1021/acs.orglett.0c03533
日期:2020.12.4
migratory rearrangement reactions of 2-oxypyridines with N-sulfonyl-1,2,3-triazoles have been developed under rhodium catalysis, providing a reliable and efficient protocol for accessing N-substituted 2-pyridones. These two distinct rearrangements feature the controllable 1,4-migration of a carbonate group from O-to-C as well as the O-to-N 1,6-migration of an acyl group via α-imino rhodium carbene transfer
Rhodium-catalyzed denitrogenative <i>gem</i>-difunctionalization of pyridotriazoles with thioesters: formal carbene insertion into C(O)–S bonds
作者:Zhe Gao、Di Jiang、Bin Li、Baiquan Wang
DOI:10.1039/d1cc06041d
日期:——
A formalcarbeneinsertion into C(O)–S bonds to access α-quaternary pyridines was achieved via a rhodium(II)-catalyzed in situ formation of sulfonium ylides from pyridotriazoles with thioesters followed by acyl group migration. This protocol has enabled an efficient denitrogenative gem-acylthiolation of pyridotriazoles to incorporate an acyl, pyridyl, and sulfur-substituted quaternary carbon center
通过铑( II )催化从吡啶三唑与硫酯原位形成锍叶立德,随后酰基迁移,实现了正式的卡宾插入C(O)-S键以接近α-季吡啶。该协议使吡啶三唑的高效脱氮宝石-酰基硫醇化能够结合酰基、吡啶基和硫取代的季碳中心,具有高选择性、广泛的底物范围和良好的官能团耐受性。