Highly functionalized α-2,3-methanoamino acid esters were prepared by the cyclopropanation of dehydroaspartic acid esters with 2-methoxyfuran or 2-siloxyfuran derivatives. These reactions proceed smoothly in the absence of any catalysts, bases, additives, or solvents.
initiated by the reaction of 1O2 with a furan and the ene-reaction of 1O2 with doublebonds together facilitated the swift assembly of the targeted compounds from simple precursors. We also introduce our most recent 1O2-facilitated synthetic strategies used in our approach to the synthesis of premnalane A. In this investigation, we explore a number of different reactivities of 1O2, thus completing a brief
在这里,我们使用功能强大的1 O 2仿生策略,描述了天然天然邻苯二酚化合物家族的成功合成方法和通心粉分子的核心合成方法中的精选亮点。在这些合成中,由1 O 2与呋喃的反应和1 O 2与双键的烯反应共同引发的级联反应序列促进了目标化合物从简单前体的快速组装。我们还将介绍我们最近的1 O 2我们在合成Prennalane A的方法中使用的辅助合成策略。在这项研究中,我们探索了1 O 2的许多不同反应性,从而完成了对如何在合成O 2的过程中有效利用1 O 2化学的简要调查复杂的次生代谢产物。
A Mild, Efficient and General Method for the Synthesis of Trialkylsilyl (<i>Z</i>)-4-Oxo-2-alkenoates and γ-Hydroxybutenolides
作者:John Boukouvalas、Nicolas Lachance
DOI:10.1055/s-1998-1574
日期:1998.1
2-Trialkylsilyloxyfurans react rapidly with dimethyldioxirane at -78 °C to provide trialkylsilyl (Z)-4-oxo-2-alkenoates whose hydrolysis delivers γ-hydroxybutenolides with high efficiency; a short synthesis of a naturally occurring monoterpene γ-hydroxybutenolide (4) is reported.
2-Trialkylsilyloxyfurans 与二甲基二环氧乙烷在 -78 °C 下快速反应,生成三烷基硅 (Z)-4-oxo-2- 烷烯酸酯,其水解反应可高效生成δ-羟基丁烯内酯;报告了天然单萜δ-羟基丁烯内酯 (4) 的简短合成。
Applications of Vinylogous Mannich Reactions. Concise Enantiospecific Total Syntheses of (+)-Croomine
作者:Stephen F. Martin、Kenneth J. Barr、Dudley W. Smith、Scott K. Bur
DOI:10.1021/ja990077r
日期:1999.8.1
extraordinarily concise asymmetric syntheses of (+)-croomine (1) have been completed using a novel strategy, highlighted by two vinylogous Mannich reactions as key constructions. The first such reaction involved the addition of 5-(4-bromobut-1-yl)-3-methyl-2-(triisopropylsilyloxy)furan to the N-acyliminium salt derived from the l-pyroglutamic acid derivative 17 to give the adduct [5(S),2‘(S),5‘(S)]-5-(4‘
Synthesis of Penta-2,4-dien-1-imines and 1,2-Dihydropyridines by Rhodium-Catalyzed Reaction of <i>N</i>-Sulfonyl-1,2,3-triazoles with 2-(Siloxy)furans
作者:Yuuta Funakoshi、Tomoya Miura、Masahiro Murakami
DOI:10.1021/acs.orglett.6b03143
日期:2016.12.16
A rhodium(II)-catalyzed reaction of N-sulfonyl-1,2,3-triazoles with 2-(siloxy)furans is reported. Either open-chain penta-2,4-dien-1-imines or cyclic 1,2-dihydropyridines are selectively obtained depending on the ligand on rhodium(II).