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Volumn 9, Issue 1, 2007, Pages 97-100

Highly enantioselective and diastereoselective 1,3-dipolar cycloaddition reactions between azomethine imines and 3-acryloyl-2-oxazolidinone catalyzed by binaphthyldiimine-Ni(II) complexes

Author keywords

[No Author keywords available]

Indexed keywords

3 ACRYLOYL 2 OXAZOLIDINONE; 3-ACRYLOYL-2-OXAZOLIDINONE; AZO COMPOUND; AZOMETHINE; BINAPHTHYLDIIMINE NI(II); DRUG DERIVATIVE; IMINE; LIGAND; NICKEL; ORGANOMETALLIC COMPOUND; OXAZOLONE; THIOSEMICARBAZONE DERIVATIVE; UNCLASSIFIED DRUG;

EID: 33846436800     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol062675y     Document Type: Article
Times cited : (133)

References (36)
  • 13
    • 0037042276 scopus 로고    scopus 로고
    • For reactions with α,β-unsaturated aldehydes, see: a
    • For reactions with α,β-unsaturated aldehydes, see: (a) Viton, F.; Bernardinelli, G.; Kündig, E. P. J. Am. Chem. Soc. 2002, 124, 4968.
    • (2002) Am. Chem. Soc , vol.124 , pp. 4968
    • Viton, F.1    Bernardinelli, G.2    Kündig, E.P.J.3
  • 24
    • 22244459251 scopus 로고    scopus 로고
    • For synthetic Utilities of chiral pyrazolidines as building blocks, see: Shirakawa, S, Lombardi, P. J, Leighton, J. L. J. Am. Chem. Soc. 2005, 127, 9974. Also see ref 10a
    • For synthetic Utilities of chiral pyrazolidines as building blocks, see: Shirakawa, S.; Lombardi, P. J.; Leighton, J. L. J. Am. Chem. Soc. 2005, 127, 9974. Also see ref 10a.
  • 29
    • 33749348910 scopus 로고    scopus 로고
    • During the preparation of this manuscript, a related paper using chiral organocatalysts has been reported. See
    • During the preparation of this manuscript, a related paper using chiral organocatalysts has been reported. See: Chen, W.; Yuan, X.-H.; Li, R.; Du, W.; Wu, Y.; Ding, L.-S.; Chen, Y.-C. Adv. Synth. Catal. 2006, 348, 1818.
    • (2006) Adv. Synth. Catal , vol.348 , pp. 1818
    • Chen, W.1    Yuan, X.-H.2    Li, R.3    Du, W.4    Wu, Y.5    Ding, L.-S.6    Chen, Y.-C.7
  • 30
    • 33846410365 scopus 로고    scopus 로고
    • Lewis acid, reaction time, trans/cis ratio, and yield were shown in order: TiCl4, 240 h, 62:38, 14, Et2AlCl, 240 h, 58:42, 8, Zn(OTf)2, 240 h, 71:29, 26, Yb(OTf)3, 192 h, 89:11, 88, Mg(OTf)2, 264 h, 96:4, 90, Co(ClO4) 2·6H2O, 90 h, 91:1, 98, Ni(ClO4) 2·6H2O, 21 h, 98:2, 95, Without Lewis acid, reflux in CHCl3 for 24 h, 49:51, 52
    • 3 for 24 h, 49:51, 52%.
  • 34
    • 33846438708 scopus 로고    scopus 로고
    • It is noteworthy that a 5,5-dimethyl moiety played an important role for high enantioselectivity. The reaction of 1-benzylidene-3-oxopyrazolidin-1-ium-2- ide under conditions similar to entry 4 gave a trans-adduct selectively (trans/cis = 93:7) with only 35% ee (yield of 86%).
    • It is noteworthy that a 5,5-dimethyl moiety played an important role for high enantioselectivity. The reaction of 1-benzylidene-3-oxopyrazolidin-1-ium-2- ide under conditions similar to entry 4 gave a trans-adduct selectively (trans/cis = 93:7) with only 35% ee (yield of 86%).
  • 35
    • 33846447894 scopus 로고    scopus 로고
    • Although the reaction proceeded smoothly, the 1H NMR study indicated that the Ni(II) complex mainly coordinated to 1a rather than to 2
    • 1H NMR study indicated that the Ni(II) complex mainly coordinated to 1a rather than to 2.
  • 36
    • 33846414779 scopus 로고    scopus 로고
    • The structure of the complex was optimized by PM3 calculations (Spartan 04).
    • The structure of the complex was optimized by PM3 calculations (Spartan 04).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.