Enantioselective Carbonyl Propargylation by Iridium-Catalyzed Transfer Hydrogenative Coupling of Alcohols and Propargyl Chlorides
作者:Sang Kook Woo、Laina M. Geary、Michael J. Krische
DOI:10.1002/anie.201203334
日期:2012.7.27
It takes alkynes! Exposure of propargylchlorides to primary benzylic alcohols in the presence of [Ir(cod)(R)‐segphos}]OTf (cod=1,5‐cyclooctadiene, segphos=5,5′‐bis(diphenylphosphino)‐4,4′‐bi‐1,3‐benzodioxole, Tf=trifluoromethanesulfonyl) results in hydrogen exchange to give allenyliridium–aldehyde pairs that combine to form products of propargylation with high ee value (see scheme). The reaction
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‐Propargylation Overrides
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‐Propargylation in Reactions of Propargyl Chloride with Primary Alcohols: Rhodium‐Catalyzed Transfer Hydrogenation
作者:Tao Liang、Sang Kook Woo、Michael J. Krische
DOI:10.1002/anie.201603575
日期:2016.8
The canonical SN2 behavior displayed by alcohols and activated alkyl halides in basic media (O‐alkylation) is superseded by a pathway leading to carbinol C‐alkylation under the conditions of rhodium‐catalyzed transfer hydrogenation. Racemic and asymmetric propargylations are described.
在铑催化的转移加氢条件下,醇和活化的烷基卤化物在碱性介质(O-烷基化)中表现出的标准S N 2行为被导致甲醇C-烷基化的途径所取代。描述了外消旋和不对称的炔丙基化。
Shostakovskii,M.F. et al., Journal of general chemistry of the USSR, 1961, vol. 31, p. 2333 - 2336