Diversity-Oriented Synthesis of Bioactive Azaspirocycles
作者:Lance T. Lepovitz、Stephen F. Martin
DOI:10.1016/j.tet.2019.130637
日期:2019.11
A collection of novel azaspirocyclic β-arylethylamines was prepared in good yield and excellent diastereoselectivity by an expedient strategy that features condensation of a cyclic ketone with an amino allylsilane and a tandem aza-Sakurai cyclization to generate several different spirocyclic N-heterocycles. Subsequent elaboration of the spirocyclic scaffold was achieved via Pictet-Spengler cyclizations
Indolyl participation in the mitsunobu reaction: retention of stereochemistry
作者:James E. Audia、Natalia Colocci
DOI:10.1016/s0040-4039(00)79374-9
日期:1991.7
The Mitsunobu reaction of trans-3-(2-hydroxycyclohexyl)indole with phthalimide results in the formation of trans-3-(2-N-phthalimidocyclohexyl)indole, presumably via indolyl participation in the displacement reaction. Involvement of symmetrical intermediate 7 is evidenced by deuterium label scrambling.
A versatile synthetic methodology for the synthesis of tryptophols
作者:Simon J Garden、Rosângela B da Silva、Angelo C Pinto
DOI:10.1016/s0040-4020(02)01048-7
日期:2002.10
Tryptophols have been obtained in high yields by the reduction of 3-substituted-dioxindoles (obtained by the aldol condensation reaction of ketones with isatins or by a modified Knovenagel malonate condensation) using a borane tetrahydrofuran complex. The reported methodology offers distinct advantages over existing methods for the synthesis of these compounds, including consistently greater yields, diastereoselective syntheses and the possibility for the synthesis of a wide range of structurally different tryptophols. The reduction reaction was found to proceed via an intermediate 1,3-diol-oxindole, which was obtained diastereoselectively and, which was subsequently reduced to the corresponding tryptophol. (C) 2002 Elsevier Science Ltd. All rights reserved.
Freter,K., Justus Liebigs Annalen der Chemie, 1978, p. 1357 - 1364
作者:Freter,K.
DOI:——
日期:——
Homobenzotetramisole: An Effective Catalyst for Kinetic Resolution of Aryl-Cycloalkanols
作者:Vladimir B. Birman、Ximin Li
DOI:10.1021/ol703119n
日期:2008.3.1
Homobenzotetramisole (HBTM), a ring-expanded analogue of the previously reported catalyst BTM, displays higher catalytic activity and a different structure-selectivity profile. It displays good enantioselectivities in kinetic resolution of secondary benzylic alcohols but is particularly effective for 2-aryl-substituted cycloalkanols.