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pro vyhledávání: '"Christian Starkemann"'
Publikováno v:
ChemInform. 22
O-Silylation of N-propionylsultam 1 provides pure Z O-silyl-N,O-ketene acetal 2 which undergoes Lewis acid promoted addition of aromatic and aliphatic aldehydes to give diastereomerically pure, crystalline “anti” aldols 7 or their silylethers 3 .
Publikováno v:
ChemInform. 22
Publikováno v:
ChemInform. 23
Publikováno v:
Tetrahedron Letters. 31:4117-4120
Crystalline sultams (R)- 2 or (S)- 2 were selectively prepared from prochiral saccharine ( 3 ) in two steps (53% overall yield) via Ru-(R)-BINAP- or Ru-(S)-BINAP catalyzed asymmetric hydrogenation of imine 4 . Alternatively, pure (R)- 2 was synthesiz
Publikováno v:
Tetrahedron Letters, Vol. 31, No 35 (1990) pp. 5019-5022
Successive treatment of ( R )- N -acylsultams 4 with NHDMS/alkyl halides or NHDMS/acyl chlorides provides alkylated or acylated products 6 or 7 . Diastereoselective reductions of 7 with Zn(BH 4 ) 2 or NaHB( s Bu) 3 gives “ syn ”- or “ anti ”-
Publikováno v:
Tetrahedron Letters, Vol. 33, No 18 (1992) pp. 2439-2442
O -Silylation of N -acetylsultam 2 gives O -silyl- N , O -ketene acetal 3 which undergoes TiCl 4 promoted addition to aromatic and aliphatic aldehydes to afford, after flash chromatography, diastereomerically pure, crystalline aldols 5 which are read
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::75e6bb4f872b8369d48e2807d3c983b0
https://archive-ouverte.unige.ch/unige:152219
https://archive-ouverte.unige.ch/unige:152219
Publikováno v:
Tetrahedron Letters, Vol. 32, No 1 (1991) pp. 61-64
O-Silylation of N-propionylsultam 1 provides pure Z O-silyl-N,O-ketene acetal 2 which undergoes Lewis acid promoted addition of aromatic and aliphatic aldehydes to give diastereomerically pure, crystalline “anti” aldols 7 or their silylethers 3 .
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4ba364a1279e3ea1c51a20aec24b78d3
https://archive-ouverte.unige.ch/unige:152456
https://archive-ouverte.unige.ch/unige:152456
Publikováno v:
Tetrahedron Letters. 29:3559-3562
Ground-state conformations of non-chelated N-enoylsultams were determined by X-ray-( 1 , 3 ) and 1H-NMR-LIS evidence. Conjugate additions of lithium tri-s-butylborohydride to 1 and 3 followed by O-acylation of the non-isolated “enolates” furnishe
Publikováno v:
Helvetica chimica acta, Vol. 70, No 8 (1987) pp. 2201-2214
The 1,4-addition of alkylmagnesium chlorides to conjugated N-enoylsultams and subsequent ‘enolate trapping’ with aq. NH4Cl or MeI/hexamethylphosphoric triamide generated centers of asymmetry at C(β) and/or at C(α) with good to excellent π-face
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::13a36024ef0a8cb24c7f263dafaf87d5
https://archive-ouverte.unige.ch/unige:155672
https://archive-ouverte.unige.ch/unige:155672
Publikováno v:
ChemInform. 19
The 1,4-addition of alkylmagnesium chlorides to conjugated N-enoylsultams and subsequent ‘enolate trapping’ with aq. NH4Cl or MeI/hexamethylphosphoric triamide generated centers of asymmetry at C(β) and/or at C(α) with good to excellent π-face