Metal-Catalyzed Cycloisomerization of Enyne Functionalities via a 1,3-Alkylidene Migration
摘要:
We report a new metal-catalyzed 6-endo-dig cyclization of cis-4,6-dien-1-yn-3-ols, which produces substituted benzene and naphthalene derivatives with structural reorganization. In this process, we observe a 1,3-alkylidene migration via cleavage of the olefin double bond of the starting substrates. The ease and reliability of this cyclization are manifested by its compatibility with a wide array of diverse substrates and several pi-alkyne activators, including PtCl2, Zn(OTf)2, AuCl, and AuCl3.
Manganese(I)-Catalyzed Synthesis of Fused Eight- and Four-Membered Carbocycles via C–H Activation and Pericyclic Reactions
作者:Youwei Xu、Guangfan Zheng、Lingheng Kong、Xingwei Li
DOI:10.1021/acs.orglett.9b01139
日期:2019.5.3
facile construction of complex cycles. On the other hand, metal-catalyzed C–Hactivation has been established as an important strategy for rapid synthesis of complex structures. The two areas are integrated in Mn(I)-catalyzed redox-neutral coupling of 3-alkenyl- and 3-allylindoles with propargylic carbonates, which occurred via C–H allenylation with subsequent pericyclic reactions to afford fused eight-
A metal‐free dehydrogenative Diels‐Alderreaction of substituted alkenes for the synthesis of tetrahydroisoindolinones has been exploited for the first time. This new method features functional group tolerance and broad substrate scope, providing an efficient access to biologically active tetrahydroisoindolinone skeletons with endo steroselectivity in good to excellent yields.
Halocyclization of o-(alkynyl)styrenes. Synthesis of 3-halo-1H-indenes
作者:Roberto Sanz、Alberto Martínez、Patricia García-García、Manuel A. Fernández-Rodríguez、Muhammad A. Rashid、Félix Rodríguez
DOI:10.1039/c0cc02590a
日期:——
o-(Alkynyl)styrenes undergo halocarbocyclization processes via a 5-endo-dig ring closure. By this strategy an efficient synthesis of 3-halo-1H-indene derivatives has been developed.
A convenient synthesis of perfluoroalkylated allylic sulfides
作者:Yanchang Shen、Qimu Liao
DOI:10.1016/0022-1139(95)03234-5
日期:1995.8
Perfluoroalkylated allylic sulfides can be synthesized by the reaction of thiophenoxymethyl lithium with fluorinated βoxoalkylphosphonium salts in 51%–72% yields.