acceptable yields after acidic treatment of the mixture for dehydration and deprotection. Introducing a chiralauxiliaryprotectinggroup into hydroxyacetone led to asymmetric allylation though stereoselectivity was around 50 % ee. Thus, the hidden aspect of the chemoselective nature of protected hydroxyacetone-derived enolate generated under thermodynamically controlled conditions has opened a new avenue for
Sequential claisen-ene approach to carbocyclization: A new entry to a steroid c/d ring synthon
作者:Kazuhiko Takahashi、Kōichi Mikami、Takeshi Nakai
DOI:10.1016/s0040-4039(00)80736-4
日期:1988.1
A new and facile entry to a steroid C/D ring synthon is described which relies on the sequential combination of the Claisen rearrangement with the intramolecular ene reaction involving an acetylenic bond with methoxycarbonyl group as the enophile.
Palladium‐Catalyzed Chemoselective Mono‐α‐Arylation of O‐Protected Hydroxyacetone with <i>Ortho</i>‐Substituted (Hetero)aryl Electrophiles
作者:Joshua W. M. MacMillan、Travis Lundrigan、Giulio Volpin、Sherif J. Kaldas、Philipp M. Holstein、Mark James Ford、Nicolas Guimond、Mark Stradiotto
DOI:10.1002/adsc.202300566
日期:2023.8.10
The mono-α-arylation of 2-tetrahydropyranyl O-protection of hydroxyacetone is reported. When using a catalyst system comprised of [Pd(cinnamyl)Cl]2 and the JosiPhos ligands PhPF-tBu or (4-CF3Ph)PF-tBu, such transformations are achieved with ortho-substituted aryl bromides and triflates in the presence of potentially contending functionalities including chloro groups.
报道了羟基丙酮的 2-四氢吡喃基 O-保护的单-α-芳基化。当使用由[Pd(肉桂基)Cl] 2和 JosiPhos 配体 PhPF- t Bu 或 (4-CF 3 Ph)PF -t Bu 组成的催化剂体系时,这种转化是通过邻位取代的芳基溴化物和三氟甲磺酸酯实现的。存在潜在竞争的官能团,包括氯基团。
Hagiwara, Hisahiro; Uda, Hisashi, Journal of the Chemical Society. Perkin transactions I, 1985, p. 283 - 288
作者:Hagiwara, Hisahiro、Uda, Hisashi
DOI:——
日期:——
Hatanaka, Minoru; Himeda, Yuichiro; Ueda, Ikuo, Journal of the Chemical Society. Perkin transactions I, 1993, # 19, p. 2269 - 2274