130835-27-7Relevant academic research and scientific papers
Asymmetric synthesis of isoquinuclidines by Diels-Alder reaction of 1,2-dihydropyridine utilizing a chiral Lewis acid catalyst
Seki, Chigusa,Hirama, Masafumi,Hutabarat, N.D.M. Romauli,Takada, Junko,Suttibut, Chonticha,Takahashi, Hideto,Takaguchi, Takuya,Kohari, Yoshihito,Nakano, Hiroto,Uwai, Koji,Takano, Nobuhiro,Yasui, Mitsukuni,Okuyama, Yuko,Takeshita, Mitsuhiro,Matsuyama, Haruo
experimental part, p. 1774 - 1781 (2012/03/10)
The chiral isoquinuclidine derivative, 2-azabicyclo[2.2.2]octane ring system, endo-(7R)-3 was obtained in good yield with excellent diastereoselectivity (up to 92% de) by Diels-Alder reaction of 1-(phenoxycarbonyl)-1,2-dihydropyridine 1 with N-acryloyl-(4S)-4- benzyloxazolidin-2-one (4S)-2 using titanium-(2R,3R)-TADDOLate 4 as a chiral Lewis acid catalyst in toluene at 0 °C. On the other hand, endo-(7S)-3 was obtained in good yield with excellent diastereoselectivity (up to 97% de) by Diels-Alder reaction of 1 with (4R)-2 using Cu(OTf)2/(4S,4′S)- bis(oxazoline) catalyst 8 as a chiral Lewis acid catalyst in dichloromethane at 0 °C. In these reactions, the choice of solvent and the combination of titanium-(2R,3R)-TADDOLate 4 {or Cu(II)/(4S,4′S)-bis(oxazoline) 8} and dienophile (4S)-2 {or (4R)-2} are very important. The stereochemistry of endo-(7R)-3 has been established to be (1R,4S,7R) and the reaction mechanism is proposed.
Towards functionalized silicon-containing α-amino acids: Asymmetric syntheses of sila analogs of homoserine and homomethionine
Smith, Richard J.,Bienz, Stefan
, p. 1681 - 1696 (2007/10/03)
The homoserine and homomethionine sila analogs, (R)-HOSi(Me 2)CH2CH(NH2)CO2H ((R)-21) and (R)-MeSCH2Si(Me2)CH2CH(NH2)CO 2H ((R)-24), respectively, were each synthesized in nine steps and in 30 and 23% overall yield, respectively, from commercially available ClSiMe 2CH2Cl. The key step of both syntheses was the asymmetric α-bromination of an Evans amide to introduce the stereogenic center of the amino acids with defined absolute configuration. While the preparation of the homomethionine analog (R)-24 followed the expected pathway, the sila analog of homoserine, (R)-21, was unexpectedly formed during the catalytic hydrogenation of an N3CH2-substituted silane derivative.
2-OXAZOLIDINONES AND THEIR USE AS INHIBITORS OF ANIMAL CELL MOTILITY AND GROWTH
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Page 53; 66, (2010/11/30)
Cell motility and growth inhibitors, including compounds of the general structural formula (I), and use of the cell motility and cell growth inhibitors, and pharmaceutically acceptable salts, pro-drugs, and solvates thereof, as therapeutic agents, are disclosed.
Process of synthesizing n-acyl auxiliaries
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, (2008/06/13)
A process of synthesizing N-acyl auxiliary compounds is disclosed. A compound of the formula: STR1 is reacted with an anhydride in the presence of a lithium salt and an amine base to produce the N-acylated auxiliary.
A practical method for N-acylation of bornane-2,10-sultam and 2-oxazolidinones
Thom,Kocienski
, p. 582 - 586 (2007/10/02)
The N-trimethylsilyl derivatives of (+)-bornane-2,10-sultam (10,10-dimethyl-5-thia-4-azatricyclo[5.2.1.03,7]decane 5,5-dioxide) and (R)-4-benzyl-2-oxazolidinone and 4-methyl-5-phenyl-2-oxazolidinone react with acid chlorides in refluxing benzen
