A Chan–Evans–Lam approach to trisubstituted vinyl ethers
作者:Jonathan K. Sader、Bryce A. Molder、Jeremy E. Wulff
DOI:10.1039/d1ob01827b
日期:——
Trisubstituted vinylethers were accessed via Chan–Evans–Lam coupling of vinyl trifluoroborates and primary aliphatic alcohols. This approach complements prior methods that required the use of neat liquid alcohol coupling partners. A palladium-catalyzed redox-relay Heck reaction was used to convert several vinylethers into aldehyde-functionalized 1,3-dihydroisobenzofurans.
Accessing 2-(Hetero)arylmethyl-, -allyl-, and -propargyl-2,1-borazaronaphthalenes: Palladium-Catalyzed Cross-Couplings of 2-(Chloromethyl)-2,1-borazaronaphthalenes
作者:Gary A. Molander、Javad Amani、Steven R. Wisniewski
DOI:10.1021/ol5030508
日期:2014.11.21
1-borazaronaphthalene has provided an opportunity to expand dramatically the functionalization of the azaborines. This azaborinyl building block can serve as the electrophile in palladium-catalyzedcross-couplingreactions to form sp3–sp and sp3–sp2 bonds. The cross-couplingreactions of 2-(chloromethyl)-2,1-borazaronaphthalene with potassium (hetero)aryl- and alkenyltrifluoroborates as well as terminal alkynes provides
<i>gem</i>
-Difluorocyclopropanation of Alkenyl Trifluoroborates with the CF<sub>3</sub>
SiMe<sub>3</sub>
-NaI System
作者:Oleksandr V. Hryshchuk、Anatolii O. Varenyk、Yevhen Yurov、Yuliya O. Kuchkovska、Andriy V. Tymtsunik、Oleksandr O. Grygorenko
DOI:10.1002/ejoc.202000346
日期:2020.4.23
Difluorocyclopropanation of alkenyltrifluoroborates using the TMSCF3–NaI system was achieved in up to 90 % yield on a multigram scale. The developed method allowed preparation of monocyclic, spiro‐ and fused‐bicyclic gem‐difluorocyclopropanes bearing additional functional groups.
Suzuki–Miyaura Cross-Coupling of Brominated 2,1-Borazaronaphthalenes with Potassium Alkenyltrifluoroborates
作者:Gary A. Molander、Steven R. Wisniewski、Elham Etemadi-Davan
DOI:10.1021/jo502260x
日期:2014.11.21
Conditions have been developed for the palladium-catalyzed cross-coupling of 3-bromo-2,1-borazaronaphthalenes with potassium alkenyltrifluoroborates. Twenty-seven alkenyl-substituted azaborines have been synthesized through this method, providing access to a family of 2,1-borazaronaphthalenes with alkenyl substitution at the C3 position.