Trifluoromethyl Nonaflate: A Practical Trifluoromethoxylating Reagent and its Application to the Regio‐ and Stereoselective Synthesis of Trifluoromethoxylated Alkenes
作者:Zhichao Lu、Tatsuya Kumon、Gerald B. Hammond、Teruo Umemoto
DOI:10.1002/anie.202104975
日期:2021.7.12
The trifluoromethoxy group has elicited much interest among drug and agrochemical discovery teams because of its unique properties. We developed trifluoromethyl nonafluorobutanesulfonate (nonaflate), TFNf, an easy-to-handle, bench-stable, reactive, and scalable trifluoromethoxylating reagent. TFNf is easily and safely prepared in a simple process in large scale and the nonaflyl part of TFNf can easily
Transition-metal-catalyzed cross-coupling chemistry can be regarded as one of the most powerful protocols to construct carbon-carbon bonds. While the field is still dominated by palladium catalysis, there is an increasing interest to develop protocols that utilize cheaper and more sustainable metal sources. Herein, we report a selective, practical, and fast iron-based cross-coupling reaction that enables
A highlyefficient one‐pot procedure for the preparation of 1‐chloroalkynes and 1‐chlorobutadiynes from terminal and trialkylsilyl‐protected precursors is reported. This convenient reaction, proceeding under mild conditions, utilizes N‐chlorosuccinimide as the chlorinating agent and tolerates a range of functional groups.
Synthesis of 1-Stannylated and 1-Iodinated 1-Chloroalkenes as Versatile Synthetic Intermediates
作者:Uli Kazmaier、Ramendra Pratap
DOI:10.1055/s-0030-1259057
日期:2010.12
An efficient and convenient synthesis of I-stannylated and iodinated 1-chloroalkenes is described based on MoBI 3 -catalyzed hydrostannations of 1-chloroalkynes, followed by a tiniodine exchange. The 1-chloro-1-iodoalkenes are suitable substrates for further modification, for example, via cross-coupling reactions.
Catalytic Asymmetric Generation of (<i>Z</i>)-Disubstituted Allylic Alcohols
作者:Luca Salvi、Sang-Jin Jeon、Ethan L. Fisher、Patrick J. Carroll、Patrick J. Walsh
DOI:10.1021/ja0762285
日期:2007.12.1
one-pot method for the direct preparation of enantioenriched (Z)-disubstituted allylicalcohols is introduced. Hydroboration of 1-halo-1-alkynes with dicyclohexylborane, reaction with t-BuLi, and transmetalation with dialkylzinc reagents generate (Z)-disubstituted vinylzinc intermediates. In situ reaction of these reagents with aldehydes in the presence of a catalyst derived from (-)-MIB generates (Z)-disubstituted