Gold(I)‐Catalyzed Ring‐Closing Alkyne‐Carbonyl Metathesis for the Synthesis of Butenolides
作者:Zhenjie Su、Pathan Mosim Amin、Shaozhong Wang
DOI:10.1002/chem.202302044
日期:2023.11.21
A gold(I)-catalyzed ring-closing alkyne-carbonyl metathesis has been developed to construct γ-butenolides and related naturally occurring compounds, featuring the concurrent formation of a carbon-carbon double bond and a ketone group in 100 % atom economy.
The vicinal dianion 2 derived from triethyl ethanetricarboxylate reacted regioselectively with aldehydes and ketones at C(p) to provide paraconic acid derivatives 5a-f in moderate to high yields as mixtures of diastereoisomers. The paraconic acid derivatives 5e and 5f were utilized as the starting materials for the syntheses of (+/-)-lichesterinic acid (12), (+/-)-phaseolinic acid (13), (+/-)-nephromopsinic acid (14), (+/-)-rocellaric acid (15), and (+/-)-dihydroprotolichesterinic acid (16).
Asahina; Yanagita, Chemische Berichte, 1936, vol. 69, p. 120,123