A concise method to synthesize 1,2,3,4-tetrahydropyridines is described that involves the use of 2-alkoxy-3,4-dihydropyran as a modular precursor to react with aniline and a nucleophile. In this method, the heteroatom of the dihydropyran ring was replaced by nitrogen of aniline while the nucleophile attached to its adjacent position. Various druglike polyheterocycles were prepared with this method
The synthesis of compounds related to the indole–indoline core of the vinca alkaloids (+)-vinblastine and (+)-vincristine
作者:Michael J. Harvey、Martin G. Banwell、David W. Lupton
DOI:10.1016/j.tetlet.2008.05.082
日期:2008.8
for introducing the aromatic residue. Subjection of these compounds to Johnson iodination and Pd[0]-catalyzed Ullmann cross-coupling of the resulting α-iodocycloalkenones 11 with 2-iodonitrobenzene (5, X = I) then affords α,α′-diaryl-α′-carbomethoxycycloalk-2-en-1-ones of the general form 10. Reductive cyclization of this last type of compound gives the corresponding indoles 9a–f (n = 1–3), some of which
The monoterpene isolated from Mentha haplocalyx, 3,3,5-trimethyl-2-oxabicyclo[2.2.2]oct-5-en-4-ol, was synthesized according to its proposed structure. However, the NMR data of the synthetic sample were not in agreement with those reported for the natural product. After considerable efforts, the genuine structure was confirmed as (1R*,2R*)-4-(1'-hydroxy-1'-methylethyl)-1-methylycyclohex-3-ene-1,2-diol
Diels–Alder Reactions of 1-Alkoxy-1-amino-1,3-butadienes: Direct Synthesis of 6-Substituted and 6,6-Disubstituted 2-Cyclohexenones and 6-Substituted 5,6-Dihydropyran-2-ones
作者:Pavel K. Elkin、Nathaniel D. Durfee、Viresh H. Rawal
DOI:10.1021/acs.orglett.1c01031
日期:2021.7.16
dienophiles to afford cycloadducts in good yields with excellent regioselectivities. The hydrolysis of the DA cycloadducts provides 6-substituted and 6,6-disubstituted 2-cylohexenones, which are versatile building blocks for complex molecule synthesis. The corresponding HDA cycloadducts afford 6-substituted 5,6-dihydropyran-2-ones.