Iron-Catalyzed Regiodivergent Hydrostannation of Alkynes: Intermediacy of Fe(IV)–H versus Fe(II)–Vinylidene
作者:Jianguo Liu、Heng Song、Tianlin Wang、Jiong Jia、Qing-Xiao Tong、Chen-Ho Tung、Wenguang Wang
DOI:10.1021/jacs.0c11448
日期:2021.1.13
iron-aryloxide catalyst (2, X = O-, R = Cy) affords an iron(II) vinylidene intermediate, allowing for gem-addition of the Sn-H to the terminal-carbon producing β-vinylstannanes. These catalytic reactions exhibit excellent regioselectivity and broad functional group compatibility and enable the large-scale synthesis of diverse vinylstannanes. Many new reactions have been established based on such a synthetic
我们报告了一种铁系统 Cp*Fe(1,2-R2PC6H4X),它通过调节离子金属-杂原子键 (Fe-X) 的反应性来控制炔烃的马尔科夫尼科夫和反马尔科夫尼科夫氢氢化。将 nBu3SnH 依次添加到铁-酰胺基催化剂 (1, X = HN-, R = Ph) 中提供了二锡基 Fe(IV)-H 物种,负责跨 C≡C 键的 Sn-H 键的顺式加成生产支链α-乙烯基锡烷。通过芳基氧化铁催化剂 (2, X = O-, R = Cy) 活化炔烃的 C(sp)-H 键,得到亚乙烯基铁 (II) 中间体,允许 Sn-H 与产生β-乙烯基锡烷的末端碳。这些催化反应表现出优异的区域选择性和广泛的官能团兼容性,能够大规模合成多种乙烯基锡烷。
Lewis Acid-Catalyzed Hydrometalation and Carbometalation of Unactivated Alkynes
作者:Naoki Asao、Yoshinori Yamamoto
DOI:10.1246/bcsj.73.1071
日期:2000.5
carbostannation of unactivatedalkynes with organosilanes, or organostannanes proceed effectively in the presence of catalytic amounts of Lewis acids to produce the corresponding vinylsilyl or vinylstannyl compounds in a highly regio- and stereoselective way. Although it is well known that transition metal catalyzed hydrometalations and carbometalations, in general, proceed in a cis-manner, the Lewis acid-catalyzed
FRYZUK, M. D.;BATES, G. S.;STONE, CH., TETRAHEDRON LETT., 1986, 27, N 14, 1537-1540
作者:FRYZUK, M. D.、BATES, G. S.、STONE, CH.
DOI:——
日期:——
Magnesium-Catalyzed Stereoselective Hydrostannylation of Internal and Terminal Alkynes
作者:Marc Magre、Marcin Szewczyk、Magnus Rueping
DOI:10.1021/acs.orglett.0c00184
日期:2020.2.21
A regio- and stereoselective magnesium-catalyzed hydrostannylation of internal and terminalalkynes has been developed. Excellent yields and selectivities are obtained for a wide range of terminal and internal symmetrical and unsymmetrical alkynes by using this alkaline earth metal catalyst as an effective alternative to transition metal catalysts.