Stereoselective synthesis of 4-substituted azetidine-2,3-diones by ring opening of 1,3-thiazolidine-derived spiro-β-lactams
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作者:
Cremonesi, Giuseppe
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Ist Chim Organ A Marchesini, Fac Farm, I-20133 Milan, ItalyIst Chim Organ A Marchesini, Fac Farm, I-20133 Milan, Italy
Cremonesi, Giuseppe
[1
]
Croce, Piero Dalla
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Univ Milan, Dipartimento Chim Organ & Ind, I-20133 Milan, Italy
ISTM, CNR, I-20133 Milan, ItalyIst Chim Organ A Marchesini, Fac Farm, I-20133 Milan, Italy
Croce, Piero Dalla
[2
,3
]
Fontana, Francesco
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Univ Milan, Dipartimento Chim Organ & Ind, I-20133 Milan, Italy
ISTM, CNR, I-20133 Milan, ItalyIst Chim Organ A Marchesini, Fac Farm, I-20133 Milan, Italy
Fontana, Francesco
[2
,3
]
La Rosa, Concetta
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Ist Chim Organ A Marchesini, Fac Farm, I-20133 Milan, ItalyIst Chim Organ A Marchesini, Fac Farm, I-20133 Milan, Italy
La Rosa, Concetta
[1
]
机构:
[1] Ist Chim Organ A Marchesini, Fac Farm, I-20133 Milan, Italy
[2] Univ Milan, Dipartimento Chim Organ & Ind, I-20133 Milan, Italy
New 3-heterocycle substituted 1,3-thiazolidine-derived 4-spiro-beta-lactams with a relative trans-configuration were stereoselectively synthesised by means of a Staudinger ketene-imine reaction between the ketene generated from the (2S,4R)-1,3-thiazolidine-2,3,4-tricarboxylic acid 3-(1,1-dimethylethyl) 4-methyl ester 1 and imines 2b-e. The 1,3-thiazolidine-derived 4-spiro-beta-lactams were transformed into the corresponding enantiomerically pure 4-heterocycle substituted azetidine-2,3-diones by means of an oxidative cleavage of the 1,3-thiazolidine ring. The opening of the 1,3-thiazolidine ring was studied under different experimental conditions and a consistent mechanism is proposed. (C) 2008 Elsevier Ltd. All rights reserved.
机构:
Veer Bahadur Singh Purvanchal Univ, Dept Chem, Jaunpur 222003, UP, India
Univ Texas Pan Amer, Dept Chem, 1250 West Univ Dr, Edinburg, TX 78539 USAVeer Bahadur Singh Purvanchal Univ, Dept Chem, Jaunpur 222003, UP, India
Yadav, Ram Naresh
Shaikh, Aarif Latif
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Univ Texas Pan Amer, Dept Chem, 1250 West Univ Dr, Edinburg, TX 78539 USAVeer Bahadur Singh Purvanchal Univ, Dept Chem, Jaunpur 222003, UP, India
Shaikh, Aarif Latif
Das, Aparna
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Prince Mohammad Bin Fahd Univ, Coll Sci & Human Studies, Dept Math & Nat Sci, Deanship Res, Al Khobar, Saudi ArabiaVeer Bahadur Singh Purvanchal Univ, Dept Chem, Jaunpur 222003, UP, India
机构:
Univ Texas Pan Amer, Dept Chem, 1250 West Univ Dr, Edinburg, TX 78539 USA
Prince Mohammad Bin Fahd Univ, Coll Sci & Human Studies, Dept Math & Nat Sci, Deanship Res, Al Khobar, Saudi ArabiaVeer Bahadur Singh Purvanchal Univ, Dept Chem, Jaunpur 222003, UP, India