154902-54-2Relevant academic research and scientific papers
Indium-mediated asymmetric barbier-type allylation of aldimines in alcoholic solvents: Synthesis of optically active homoallylic amines
Vilaivan, Tirayut,Winotapan, Chutima,Banphavichit, Vorawit,Shinada, Tetsuro,Ohfune, Yasufumi
, p. 3464 - 3471 (2007/10/03)
(Chemical Equation Presented) Chiral aldimines derived from phenylglycinol were diastereoselectively allylated with indium powder/allyl bromide in alcoholic solvents. Both aliphatic and aromatic aldimines provided good yield of the desired products with h
Design, synthesis, and 1,3-dipolar cycloaddition of (5R)- [and (5S)]-5,6-dihydro-5-phenyl-2H-1,4-oxazin-2-one N-oxides as chiral (E)-geometry-fixed α-alkoxycarbonylnitrones
Tamura,Gotanda,Yoshino,Morita,Terashima,Kikuchi,Miyawaki,Mita,Yamashita,Ishibashi,Sakamoto
, p. 8544 - 8551 (2007/10/03)
Optically pure (5R)- [and (5S)]-5,6-dihydro-5-phenyl-2H-1,4-oxazin-2-one N-oxides [(5R)- and (5S)-2] were designed as chiral (E)-geometry-fixed α-alkoxycarbonylnitrones 1. The nitrones (5R)- and (5S)-2 were synthesized by three-step oxidation of (R)- and (S)-phenylglycinols [(R)- and (S)-3], condensation of the resulting (R)- and (S)-2-hydroxylamino-2-phenylethanols [(R)- and (S)-5] with glyoxylic acid, and cyclization of the intermediary nitrones (R)- and (S)-6b. The nitrone (5R)-2 reacted with olefins 7-14 under mild conditions to afford the corresponding cycloadducts 15-22 as the main products via the least sterically demanding exo modes. Cycloadduct 30 obtained from (5S)-2 and cyclopentadiene was effectively elaborated to (1S,4S,5R)-4-benzyloxycarbonylamino-2-oxabicyclo[3.3.0]oct-7-en-3-one (28), the key synthetic intermediate of carbocyclic polyoxin C.
Diastereoselective addition of chiral imines and 1,3-oxazolidines with Grignard reagents; asymmetric synthesis of (R)-2-aryl- and (R,R)-2,5-bis(aryl)pyrrolidines
Higashiyama, Kimio,Inoue, Hiroaki,Takahashi, Hiroshi
, p. 1083 - 1092 (2007/10/02)
Asymmetric syntheses of (R)-2-aryl- and (R,R)-2,5-bis(aryl)pyrrolidines were described starting from chiral aromatic imines derived from (R)-phenylglycinol, in which the diastereoselective additions of Grignard reagents to the chiral imines and 1,3-oxazol
DIASTEREOSELECTIVE ADDITION OF ORGANOMETALLIC REAGENTS TO CHIRAL IMINES AND 1,3-OXAZOLIDINES
Higashiyama, Kimio,Inoue, Hiroaki,Takahashi, Hiroshi
, p. 235 - 238 (2007/10/02)
The reaction of MeLi or MeMgBr with chiral aromatic imines and 2-aryl-1,3-oxazolidines derived from (R)-phenylglycinol afforded with good diastereoselectivity (R,R)-amines from imines, but the (R,S)-amines from 1,3-oxazolidines, respectively.
Diastereoselective Strecker Synthesis using α-Phenylglycinol as Chiral Auxiliary
Chakraborty, T. K.,Reddy, G. V.,Hussain, K. Azhar
, p. 7597 - 7600 (2007/10/02)
Use of α-phenylglycinol as chiral auxiliary in Strecker synthesis ensures high diastereoselectivity and its easy removal by oxidative cleavage allows large scale preparation of optically active α-amino acids.
