Total synthesis of (±)-6-deoxycastanospermine: an application of the addition of organoboronates to N-acyliminium ions
作者:Robert A Batey、D.Bruce MacKay
DOI:10.1016/s0040-4039(00)01790-1
日期:2000.12
An efficient synthesis of (±)-6-deoxycastanospermine is reported, using a diastereoselective coupling of organoboronates with N-acyliminiumions as the key step. The construction of the indolizidine ring system is completed using a subsequent reductive amination reaction.
Metal-Catalyzed Cycloisomerization Reactions of <i>cis</i>-4-Hydroxy-5-alkynylpyrrolidinones and <i>cis</i>-5-Hydroxy-6-alkynylpiperidinones: Synthesis of Furo[3,2-<i>b</i>]pyrroles and Furo[3,2-<i>b</i>]pyridines
作者:Jasmine C. Jury、Nalivela Kumara Swamy、Arife Yazici、Anthony C. Willis、Stephen G. Pyne
DOI:10.1021/jo9007942
日期:2009.8.7
Furo[3,2-b]pyrroles and furo[3,2-b]pyridines can be conveniently prepared in good yields from the cycloisomerization reactions of cis-4-hydroxy-5-alkynylpyrrolidinones and cis-5-hydroxy-6-alkynylpiperidinones, respectively, using Ag(I), Pd(II)/Cu(I), or Au(I) catalysis. In one case, the cycloisomerization product was unstable and produced a furanderivative by a ring-opening reaction.
顺式-4-羟基-5-炔基吡咯烷酮与顺式-5-羟基-6-炔基哌啶子酮的环异构化反应可方便地以高收率制备呋喃并[3,2- b ]吡咯和呋喃[3,2- b ]吡啶分别使用Ag(I),Pd(II)/ Cu(I)或Au(I)催化。在一种情况下,环异构化产物不稳定并且通过开环反应产生呋喃衍生物。
Differential oxidation of endocyclic enecarbamates. Synthesis of cyclic β-hydroxy-α-amino acids
作者:Claudia H. Sugisaki、Patrick J. Carroll、Carlos Roque D. Correia
DOI:10.1016/s0040-4039(98)00536-x
日期:1998.5
The differential oxidation of five and six-membered endocyclic enecarbamates was investigated employing m-CPBA, DMD, as well as enantioselective protocols such as the Kochi-Jacobsen-Katsuki's epoxidation and the Sharpless dihydroxylation. By this strategy the syntheses of beta-hydroxyprolines and beta-hydroxypipecolic acids were accomplished. X-Ray crystallographic analysis of the trans-beta-hydroxypipecolic acid was instrumental to solve structural assignment conflicts. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
Alkenyl and Aryl BoronatesMild Nucleophiles for the Stereoselective Formation of Functionalized <i>N</i>-Heterocycles