Domino synthesis of indenols and alkyl-indene ethers under modified Vilsmeier conditions
摘要:
Indenols are produced in high yields through domino reactions, when electron-rich trans-stilbenes and other trans arylalkyl olefins were subjected to Vilsmeier formylation in the presence of excess POCl3 in a one-pot procedure. The method is even suitable for converting aryl-alkyl carbinols (precursors for olefins) directly into indenols. The corresponding indene ethers could be prepared in high yields directly when less reactive alpha,beta-unsaturated aldehydes were subjected to cyclization in alcoholic HCl. (c) 2006 Elsevier Ltd. All rights reserved.
Highly <i>E</i>-Selective, Stereoconvergent Nickel-Catalyzed Suzuki–Miyaura Cross-Coupling of Alkenyl Ethers
作者:Guo-Ming Ho、Heiko Sommer、Ilan Marek
DOI:10.1021/acs.orglett.9b00946
日期:2019.4.19
An improved method for the nickel-catalyzed Suzuki-Miyaura cross-coupling of alkenyl ethers is reported. This stereoconvergent protocol allows for the utilization of a wide range of alkenyl ethers and aryl boronic esters for the synthesis of variously substituted styrene derivatives. An olefinic mixture with respect to the alkenyl ethers can be employed, thereby circumventing the stereodefined synthesis of starting materials. Preliminary mechanistic investigations indicate a nickel-catalyzed olefin isomerization following initial stereoretentive cross-coupling.
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