Golden opportunities in natural product synthesis: first total synthesis of (−)-isocyclocapitelline and (−)-isochrysotricine by gold-catalyzed allene cycloisomerization
The first enantioselective intramolecularC−Hinsertion and cyclopropanation reactions of donor‐ and donor/donor‐carbenes by a nondiazo approach are reported. The reactions were conducted in a one‐pot manner without slow addition and provided the desired dihydroindole, dihydrobenzofuran, tetrahydrofuran, and tetrahydropyrrole derivatives with up to 99 % ee and 100 % atom efficiency.
The use of acetylenic aldehydes in Baylis–Hillman reactions: synthesis of versatile allyl propargyl alcohols
作者:Palakodety Radha Krishna、Empati Raja Sekhar、V. Kannan
DOI:10.1016/s0040-4039(03)01169-9
日期:2003.6
The utility of acetylenic aldehydes in Baylis–Hillman reactions giving allyl propargyl alcohols in moderate to good yields is reported.
据报道,炔醛在Baylis-Hillman反应中的应用使烯丙基炔丙醇的产率中等至良好。
Gold-Catalyzed Deacylative Cycloisomerization Reactions of 3-Acylindole/ynes: A New Approach for Carbazole Synthesis
作者:Lu Wang、Guijie Li、Yuanhong Liu
DOI:10.1021/ol2012154
日期:2011.8.5
The synthesis of functionalized carbazoles through gold-catalyzed deacylative cycloisomerization of 3-acylindole/ynes is described. A mechanistic proposal for these transformations involving a novel carbonyl group facilitated heterolytic fragmentation upon the loss of an acylium ion intermediate is presented. The eliminated acylium ion species could be trapped by the organogold intermediate to afford
Catalytic Asymmetric Direct Henry Reaction of Ynals: Short Syntheses of (2S,3R)-(+)-Xestoaminol C and (−)-Codonopsinines
作者:Daisuke Uraguchi、Shinji Nakamura、Takashi Ooi
DOI:10.1002/anie.201004072
日期:——
Triple for all: Various optically active anti‐β‐nitro propargylic alcohols are synthesized by the catalytic stereoselective addition of nitroalkanes to ynals (the directHenryreaction of ynals). The utilization of the rich chemistry of carbon–carbon triple bond allows rapid access to three natural products.
Pd-catalyzed cross-coupling of terminal alkynes with ene-yne-ketones: access to conjugated enynes via metal carbene migratory insertion
作者:Ying Xia、Zhen Liu、Rui Ge、Qing Xiao、Yan Zhang、Jianbo Wang
DOI:10.1039/c5cc03559g
日期:——
Pd-catalyzed oxidative cross-coupling of terminal alkynes with ene-yne-ketones has been developed, in which the ene-yne-ketones are served as carbene precursors and metal carbene migratory insertion process is the key step for C–C bond formation.