C−C Bond Formation of Benzyl Alcohols and Alkynes Using a Catalytic Amount of KO<sup>t</sup>
Bu: Unusual Regioselectivity through a Radical Mechanism
作者:Amit Kumar、Trevor Janes、Subrata Chakraborty、Prosenjit Daw、Niklas von Wolff、Raanan Carmieli、Yael Diskin-Posner、David Milstein
DOI:10.1002/anie.201812687
日期:2019.3.11
We report a C−Cbond‐forming reaction between benzylalcohols and alkynes in the presence of a catalyticamount of KOtBu to form α‐alkylated ketones in which the C=O group is located on the side derived from the alcohol. The reaction proceeds under thermal conditions (125 °C) and produces no waste, making the reaction highly atom efficient, environmentally benign, and sustainable. Based on our mechanistic
C-Alkylation by Phenalenyl-Based Molecule <i>via</i> a Borrowing Hydrogen Pathway
作者:Ananya Banik、Paramita Datta、Swadhin K. Mandal
DOI:10.1021/acs.orglett.3c00223
日期:2023.3.3
The present study demonstrates the first transition-metal-free catalytic C-alkylation via a borrowing hydrogen pathway for the α-alkylation of ketone, synthesis of substituted quinoline, and 9-monoalkylation of fluorene. With applications on diversification of biologically active molecules and gram-scale synthesis, a preliminary investigation of the reaction mechanism has been carried out, suggesting
A new method for converting terminal epoxides and primary alcohols into α-alkylated ketones under borrowing hydrogen conditions is reported. The procedure involves a one-pot epoxide ring opening and alkylation via primary alcohols in the presence of an N-heterocyclic carbene iridium(I) catalyst, under aerobic conditions, with water as the side product.