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Volumn 2, Issue 8, 2005, Pages 752-754

(Salen)Ti(IV)-catalyzed asymmetric ring-opening of monosubstituted epoxides with dithiophosphorus acid

Author keywords

(Salen)Ti(IV) complex; Asymmetric ring opening; Enantioselectivity; Monosubstituted epoxides; Regioselectivity

Indexed keywords


EID: 33751320013     PISSN: 15701786     EISSN: None     Source Type: Journal    
DOI: 10.2174/157017805774717436     Document Type: Review
Times cited : (2)

References (37)
  • 26
    • 46149102618 scopus 로고    scopus 로고
    • Aldasheva, A.; Beishekeev, Zh.; Dzhundubaev, K. D.; Toktobekova, T. Izv. Akad. Nauk. Kirg. SSR 1980, 4, 52 (Chem. Abstr. 1981,94, 12134).
    • (e) Aldasheva, A.; Beishekeev, Zh.; Dzhundubaev, K. D.; Toktobekova, T. Izv. Akad. Nauk. Kirg. SSR 1980, 4, 52 (Chem. Abstr. 1981,94, 12134).
  • 37
    • 46149123364 scopus 로고    scopus 로고
    • General procedure for the (salen)Ti(IV)-catalyzed ring-opening reaction: To a 25 mL of 4-necked flask was placed 0.1 mmol of chiral salen ligand, 5 mL of dry toluene, and 0.1 mmol of Ti(OPr-i)4 at room temperature under a nitrogen atmosphere. After stirring for 1 h, to the resulting mixture was added dropwise 1 mmol of dithiophosphorus acid. The reaction was stirred for additional 0.5 h. Then 1mmol of epoxide was added and the whole was stirred for 5-10 min (monitored by TLC, After removal of solvent, the crude product was analyzed by 31P NMR, and then purified by column chromatography on silica gel (200-300 mesh, gradient eluted with petroleum ether/ethyl acetate) to provide the ring-opening product 4 and 5. The ee value of the product was fdetermined by chiral HPLC analysis
    • 31P NMR, and then purified by column chromatography on silica gel (200-300 mesh, gradient eluted with petroleum ether/ethyl acetate) to provide the ring-opening product 4 and 5. The ee value of the product was fdetermined by chiral HPLC analysis.


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