Enantiocontrolled synthesis of polychlorinated hydrocarbon motifs: a nucleophilic multiple chlorination process revisited.
Polychlorinated hydrocarbon motifs have been synthesized in enantiomerically pure forms by means of nucleophilic multiple chlorinations of chiral epoxides, which stereospecifically incorporate halogen atoms into oxygenated molecular scaffolds. The present study demonstrates the scope of the N-chlorosuccinimide (NCS)/organophosphine reagent system that forms multiple sp(3)C-Cl bonds in a regularly repeating pattern with proper stereochemical configurations and evaluates its applicability to various epoxides having elaborate structures. It is noteworthy that tetrachlorinated motifs are produced in one step from bisepoxides by using NCS/Ph(3)P. Furthermore, Ph(2)PCl used in combination with NCS has been found to serve as a potentially useful alternative to NCS/Ph(3)P, especially for promoting dichlorination reactions of alkenyl-substituted epoxides.
Yoshimitsu
Takehiko
T
Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan. yoshimit@phs.osaka-u.ac.jp
Fukumoto
Naoya
N
Tanaka
Tetsuaki
T
D004852:Epoxy Compounds / Q000737:chemistry; D054879:Halogenation; D006843:Hydrocarbons, Chlorinated / Q000138:chemical synthesis* / Q000737:chemistry; D007202:Indicators and Reagents / Q000737:chemistry; D010720:Phosphines / Q000737:chemistry; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D013237:Stereoisomerism; D013379:Substrate Specificity; D013388:Succinimides / Q000737:chemistry
D004852:Epoxy Compounds; D006843:Hydrocarbons, Chlorinated; D007202:Indicators and Reagents; D010720:Phosphines; D011108:Polymers; D013388:Succinimides; C015752:N-chlorosuccinimide