Ring Opening of Cyclic Vinylogous Acyl Triflates Using Stabilized Carbanion Nucleophiles: Claisen Condensation Linked to Carbon−Carbon Bond Cleavage
作者:David M. Jones、Marilda P. Lisboa、Shin Kamijo、Gregory B. Dudley
DOI:10.1021/jo100249g
日期:2010.5.21
Addition of stabilized carbanionic nucleophiles to cyclic vinylogous acyl triflates (VATs) triggers a ring-opening fragmentation to give acyclic β-keto ester and related products, much like those observed traditionally in the Claisen condensation. Unlike in the classical Claisen condensation, however, the VAT-Claisen reaction described herein is rendered irreversible by C−C bond cleavage, not by deprotonation
Synthesis of the C1-C15 Region of Palmerolide A Using Refined Claisen-Type Addition-Bond Cleavage Methodology
作者:Gregory Dudley、David Jones
DOI:10.1055/s-0029-1218565
日期:2010.1
Synthesis of the eastern hemisphere (C1-C15) of palmerolide A is described. A re-optimized Claisen-type condensation of vinylogous acyl triflates provides efficient entry into the C1-C8 subunit, setting up a convergent Horner-Wittig olefination to deliver the eastern portion of palmerolide A.
介绍了帕美内酯 A 的东半球(C1-C15)的合成。经过重新优化的乙烯基酰基三甲酸酯的克来森型缩合反应提供了进入 C1-C8 亚基的有效途径,并建立了一个会聚的霍纳-维蒂希烯化反应,以提供帕美内酯 A 的东部部分。