Chemical consequences of conformation in macrocyclic compounds
作者:W.Clark Still、Igor Galynker
DOI:10.1016/s0040-4020(01)93273-9
日期:——
In this paper we show that the conformational properties of medium- and large-ring organic molecules have profound consequences on the stereochemical course of their chemical reactions. Kinetic enolate alkylations, dimethylcuprate additions and catalytic hydrogenations were examined on a variety of monosubstituted 8- to 12-membered macrocyclic ketones and lactones, and the diastereomeric composition
Floc'h, Y. Le; Yvergnaux, F.; Toupet, L., Bulletin de la Societe Chimique de France, 1991, # 5, p. 742 - 759
作者:Floc'h, Y. Le、Yvergnaux, F.、Toupet, L.、Gree, R.
DOI:——
日期:——
BESTMANN, HANS JURGEN;SCHOBERT, RAINER, SYNTHESIS,(1989) N, C. 419-423
作者:BESTMANN, HANS JURGEN、SCHOBERT, RAINER
DOI:——
日期:——
Kumulierte Ylide XX.<sup>1</sup>Synthesen (<i>E</i>)-α,β-ungesättigter macrocyclischer Lactone durch intramolekulare Wittig-Olefinierung via Triphenylphosphoranylidenketen<sup>2</sup>
作者:Hans Jürgen Bestmann、Rainer Schobert
DOI:10.1055/s-1989-27271
日期:——
Cumulated Ylides XX.1 Syntheses of (E)-α,β-Unsaturated Macrocyclic Lactones by Intramolecular Wittig-Olefination via Triphenylphosphoranylideneketene2 Two methods for closure of macrocyclic lactone rings by intramolecular Wittig reaction of (Ï-oxoalkoxy)carbonylmethylenetriphenylphosphoranes are described. The latter are easily accessible by addition of the appropriate (free or protected) Ï-hydroxyalkanals to the cumulated ylide triphenylphosphoranylideneketene. Examples are then given for the use of these methods in natural product synthesis.