Divergent Regioselectivity in the Base-Promoted Reactions of Cyclic Eight-Membered α-Ketols with Activated Halides
作者:Leo A. Paquette、Ivan Vilotijevic、David Hilmey、Jiong Yang
DOI:10.1021/ol027315z
日期:2003.2.1
[reaction: see text] Deprotonation of 2-hydroxycyclooctanone followed by exposure to an allylic or benzylic halide proceeds very selectively to give the product of C-alkylation. The effect of Delta(5,6)-unsaturation is to promote instead the formation of the O-alkylated derivative. This crossover in kinetic preference is attributed to an inability of the olefinic system to attain a conformation conducive
Synthesis of Stereoisomeric Medium-Ring α,α‘-Dihydroxy Cycloalkanones
作者:Leo A. Paquette、Ryan E. Hartung、John E. Hofferberth、Ivan Vilotijevic、Jiong Yang
DOI:10.1021/jo0358675
日期:2004.4.1
The stereochemical course of the epoxidation of the silyl enolethers of 2-tert-butyldimethylsilyloxycycloheptanone and -cyclooctanone has been investigated and shown to proceed exclusively anti to the existing α-substituent. 2-(Benzyloxy)cyclooctanone behaves similarly, and the presence of a transannular double bond does not alter the outcome. α-Ketol rearrangements are seen to operate during ensuing
Synthesis of the sex pheromone, (7Z,11Z/E)-7,11-hexadecadienyl acetate, of the pink bollworm moth, Pectinophora gossypiella, and intermediates therefor.
Preparation of gossyplureand 1-Metallo-5,9-tetradecadiene
申请人:PHILLIPS PETROLEUM COMPANY
公开号:EP0195342A2
公开(公告)日:1986-09-24
Process for the production of the insect sex attractant, gossyplure, is provided. The process comprises first disproportionating 1,5-cyclooctadiene and 1-hexene to give 1,5,9-tetradecatriene, then metallating the triene to form a 1- metallo-5,9-tetradecadiene, and finally treating the or- ganometal compound with a C2-synthon to give directly 7,11 - hexadecadienyl acetate or a substituted 7,11-hexadecadienyl moiety which can readily be converted to the desired acetate.