CsF-Mediated in Situ Desilylation of TMS-Alkynes for Sonogashira Reaction
作者:Joseph S. Capani、John E. Cochran、Jianglin (Colin) Liang
DOI:10.1021/acs.joc.9b01307
日期:2019.7.19
A practical and mild set of conditions for the Sonogashirareaction utilizing CsF-mediated in situ TMS-alkyne desilylation followed by Sonogashira coupling has been developed for the synthesis of a variety of alkynyl benzenes and heteroarenes in good to excellent yields. This methodology demonstrates excellent functional group tolerance and simple purification, which allows large-scale industrial applications
Trisulfur Radical Anion (S<sub>3</sub><sup>•–</sup>) Involved [1 + 2 + 2] and [1 + 3 + 1] Cycloaddition with Aromatic Alkynes: Synthesis of Tetraphenylthiophene and 2-Benzylidenetetrahydrothiophene Derivatives
作者:Jing-Hao Li、Qi Huang、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/acs.orglett.8b02066
日期:2018.8.3
S3•–-mediated [1 + 2 + 2] and [1 + 3 + 1] cycloaddition reactions of aromatic alkynes to give tetraphenylthiophene and 2-benzylidenetetrahydrothiophene derivatives via two C–S bond formations are developed. These two protocols provide new, simple, and straightforward strategies to construct tetraphenylthiophene and 2-benzylidenetetrahydrothiophene derivatives under transition-metal-free conditions
One-Pot Procedure for the Synthesis of<i>N</i>-Substituted 2-(Arylmethyl)pyrrolidines from 1-Aryl-2-cyclopropylalkynes and Primary Amines by a Hydroamination/Cyclopropylimine Rearrangement/Reduction Sequence
作者:Kerstin Gräbe、Björn Zwafelink、Sven Doye
DOI:10.1002/ejoc.200900515
日期:2009.11
A one-pot procedure for the synthesis of N-substituted 2-(arylmethyl)pyrrolidines from 1-aryl-2-cyclopropylalkynes and primary amines is presented. The procedure proceeded first through an [Ind2TiMe2]-catalyzed regioselective hydroamination of a 1-aryl-2-cyclopropylalkyne with a primary amine. The resulting cyclopropylimine, which was not isolated, was then forced to undergo a cyclopropylimine rearrangement
Fe-catalyzed highly selective ring expansion of alkynylcyclopropyl alkanols to cyclobutanols
作者:Anjun Chen、Riyuan Lin、Qingjian Liu、Ning Jiao
DOI:10.1039/b916623h
日期:——
A Fe-catalytic highly selective ring expansion reaction of alkynylcyclopropyl alkanols to alkynylcyclobutanols via a 1,2-carbon shift under mild conditions was developed. A new class of homogeneous FeCl2/O2 catalytic system was employed in these novel transformations.