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Volumn 53, Issue 18, 1997, Pages 6281-6294

Synthesis of (4S)-hydroxymethyl-(2R)-(2-propyl)-butyrolactone: A quest for a practical route to an important hydroxyethylene isostere chiron

Author keywords

[No Author keywords available]

Indexed keywords

GAMMA BUTYROLACTONE DERIVATIVE;

EID: 0030901239     PISSN: 00404020     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4020(97)00298-6     Document Type: Article
Times cited : (18)

References (48)
  • 11
    • 0025952925 scopus 로고
    • For a review, see a) Huff, J. R. J. Med. Chem. 1991, 34, 2305.
    • (1991) J. Med. Chem. , vol.34 , pp. 2305
    • Huff, J.R.1
  • 32
    • 84920296985 scopus 로고    scopus 로고
    • note
    • Studies to try and epimerize the C-2 centre in compound 5 using a variety of bases proved challenging. Only tert-butoxide/THF gave a reasonable ratio (2:5 = 1:1), while other bases including DBU, failed to generate any of the desired isomer. Formation of the lithium enolate (dianion) of 6 followed by protonation with a variety of compounds bearing acidic protons on either oxygen or carbon were unrewarding.
  • 37
    • 84920296984 scopus 로고    scopus 로고
    • note
    • Encouragingly, the amount of C-2 epimer 13 was found to increase when LiOH was employed as the hydroxide source, however, further epimerization experiments using LiOH proved capricious.
  • 39
    • 0000601855 scopus 로고
    • and references therein
    • For the use of α-trimethlysilylketones and aldehydes as alkene precursors, see a) Hudrlik, P.F.; Kulkarni, A.K. J. Am. Chem. Soc. 1981, 103, 6251 and references therein,
    • (1981) J. Am. Chem. Soc. , vol.103 , pp. 6251
    • Hudrlik, P.F.1    Kulkarni, A.K.2
  • 45
  • 47
    • 84920296983 scopus 로고    scopus 로고
    • note
    • In order to obtain consistently high yields for the cross-aldol step with l -trimethylsilylpropan-2-one, it must be stored at 0 °C and re-distilled prior to use.
  • 48
    • 84920296982 scopus 로고    scopus 로고
    • The use of diethyl ether as the solvent resulted in a 3:1 α:β ratio
    • The use of diethyl ether as the solvent resulted in a 3:1 α:β ratio.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.