The Effect of Halogen Atoms on the Reactivity of Other Halogen Atoms in the Same Molecule. VI. The SN2 Reactivity of Methylene and Polymethylene Halides1
Photoredox relay-catalyzed <i>gem</i>-difluoroallylation of alkyl iodides
作者:Yuanqiang Guo、Yunpeng Cao、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1039/d1cc04284j
日期:——
photocatalyst catalyze the reaction at different stages in the desired sequence under the same reaction conditions, and do not inhibit each other. This convenient method transforms a broad scope of alkyliodides into the corresponding gem-difluoroalkenes via C(sp3)–C(sp3) bond construction. The protocol has good functional group tolerance and is suitable for the late-stage modification of multifunctional
Direct Synthesis of Water-Tolerant Alkyl Indium Reagents and Their Application in Palladium-Catalyzed Couplings with Aryl Halides
作者:Zhi-Liang Shen、Kelvin Kau Kiat Goh、Yong-Sheng Yang、Yin-Chang Lai、Colin Hong An Wong、Hao-Lun Cheong、Teck-Peng Loh
DOI:10.1002/anie.201005798
日期:2011.1.10
A direct result: Alkylindiumreagents are synthesized by the insertion of indium into alkylhalide mediated by CuCl. The synthetic utility of these reagents is demonstrated by their palladium‐catalyzed coupling with arylhalides (see scheme). The reagents are compatible with various functional groups, and this makes the protocol generally useful in organic synthesis. DMA=N,N‐dimethylacetamide, TB
作者:Vemula Praveen Kumar、Vaddela Sudheer Babu、Kenzo Yahata、Yoshito Kishi
DOI:10.1021/acs.orglett.7b01128
日期:2017.5.19
Fe/Cu-mediated one-pot ketonesynthesis was reported. Unlike Ni- and Pd-mediated one-pot ketone syntheses, the reported Fe/Cu-mediated method allowed selective activation and coupling of alkyl iodides over vinyl iodides. The newly developed one-pot ketonesynthesis was applied to a synthesis of vinyl iodide/ketone 13, the left half of halichondrin B, as well as vinyl iodide/ketone 8a, the C20–C26 building
Rhodium‐Catalyzed Highly Regio‐ and Enantioselective Hydrogenation of Tetrasubstituted Allenyl Sulfones: An Efficient Access to Chiral Allylic Sulfones
A highlyregio‐ and enantioselective hydrogenation of challenging tetrasubstituted allenyl sulfones has been developed, affording chiral allylic sulfones in good yields with excellent regio‐ and enantioselectivities (up to 99 % yield and 99 % ee). This method provides an efficient and concise route to chiral allylic sulfones, thus offering an atom‐economic process with a wide range of potential applications
Compounds and methods are provided for the treatment of disease conditions in which modification of cholinergic, especially muscarinic m1, m4, or both m1 and m4, receptor activity has a beneficial effect. In the method, an effective amount of a compound is administered to a patient in need of such treatment.