Iron Phosphine Catalyzed Cross-Coupling of Tetraorganoborates and Related Group 13 Nucleophiles with Alkyl Halides
作者:Robin B. Bedford、Peter B. Brenner、Emma Carter、Jamie Clifton、Paul M. Cogswell、Nicholas J. Gower、Mairi F. Haddow、Jeremy N. Harvey、Jeffrey A. Kehl、Damien M. Murphy、Emily C. Neeve、Michael L. Neidig、Joshua Nunn、Benjamin E. R. Snyder、Joseph Taylor
DOI:10.1021/om500518r
日期:2014.10.27
Iron phosphinecomplexes prove to be good precatalysts for the cross-coupling of alkyl, benzyl, and allyl halides with not only aryl triorganoborate salts but also related aluminum-, gallium-, indium-, and thallium-based nucleophiles. Mechanistic studies revealed that while Fe(I) can be accessed on catalytically relevant time scales, lower average oxidation states are not formed fast enough to be relevant
Copper-catalyzed cross-coupling of aryl-, primary alkyl-, and secondary alkylboranes with heteroaryl bromides
作者:Allison M. Bergmann、Adam M. Oldham、Wei You、M. Kevin Brown
DOI:10.1039/c8cc03145b
日期:——
A method for the Cu-catalyzed cross-coupling of both aryl and alkylboranes with aryl bromides is described. The method employs an inexpensive Cu-catalyst and functions for a variety of heterocyclic as well as electron deficient aryl bromides. In addition, aryl iodides of varying substitution patterns and electronic properties work well.
of the copper‐catalyzed coupling reactions between organoboron compounds and allylic phosphates is expanded significantly by employing triphenylphosphine as a ligand for copper, allowing the use of secondary alkylboron compounds. The reaction proceeds with complete γ‐E‐selectivity and preferential 1,3‐syn stereoselectivity. The reaction of γ‐silicon‐substituted allylic phosphates affords enantioenriched
作者:Bernd Wrackmeyer、Klaus Wagner、Sultan T. Abu-Orabi
DOI:10.1016/0022-328x(88)80133-5
日期:1988.6
The influence of functional groups in R1 on the course of the organoboration reaction of alkynylstannanes 1, Me3SnCCR1 (R1 = OEt (a), 3-Methoxyphenyl (b), 2-Pyridyl (c)) has been studied. The reaction of 1 with triethylborane (2) yields the products (4), with the stannyl and boryl groups always in the cis-position. In the case of the reaction between 2 and 1c it has been observed for the first time
Total Synthesis of (+)-Erogorgiaene Using Lithiation–Borylation Methodology, and Stereoselective Synthesis of Each of Its Diastereoisomers
作者:Tim G. Elford、Stefan Nave、Ravindra P. Sonawane、Varinder K. Aggarwal
DOI:10.1021/ja207869f
日期:2011.10.26
A short (8 steps) synthesis of (+)-erogorgiaene in 44% overall yield from p-methylacetophenone is described. Key steps include lithiation/borylation-protodeboronation to build up the molecule and control the stereochemistry at C1 and C4. The C11 stereochemistry was similarly set up by using lithiation/borylation methodology. The use of a mixed, unhindered borane in the lithiation/borylation reaction