copper-catalysed rearrangement of cyclic ethynylethylene carbonates has been discovered, and the in situ-formed allenal intermediates could react with a range of nucleophiles to furnish synthetically useful and highly functionalised products through the addition pathways. Mechanisticstudies reveal that the reaction proceeds through the base-mediated deprotonation as the key step to induce the rearrangement.
作者:Soichiro Yasui、Shona Banjo、Yoshiyuki Nagashima、Yuto Okada、Kao Yoshikawa、Keisuke Nakata、Noritaka Chida、Toshitaka Okamura、Takaaki Sato
DOI:10.1002/anie.202402335
日期:2024.4.22
has prevented the late-stage installation of the enamide side chains, which play a crucial role in the biological activity. Now a common bislactone intermediate has been used for the totalsynthesis of lobatamides A and C.
An enantioselective allenylation of aldehydescatalyzed by a chiral, nonracemic phosphoricacid was reported. Under the developed conditions, 1,1′‐disubstituted allenic alcohols were obtained in 64–98% yields with 88–99% ee. Computational studies were conducted to probe the origin of asymmetric induction. Mechanistic studies suggest that the pinacol moiety of the propargylboronate is critical to the