Truncated diastereoselective Passerini reaction, a rapid construction of polysubstituted oxazole and peptides having an α-hydroxy-β-amino acid component
作者:Guylaine Cuny、Rocio Gámez-Montaño、Jieping Zhu
DOI:10.1016/j.tet.2004.03.084
日期:2004.5
including aliphatic and aromatic ones, with amides of α-isocyano-β-phenylpropionic acid in toluene in the presence of lithium bromide gives 2,4,5-trisubstituted oxazoles in good to excellent yield. Protected chiral α-amino aldehydes participate in this reaction to give, after hydrolysis of the oxazoles, norstatine-containing peptides in good overall yield. The nucleophilic addition of isonitriles to N
醛和酮,包括脂肪族和芳香族的酮类,与α-异氰基-β-苯基丙酸的酰胺在甲苯中,在溴化锂的存在下反应,可以很好地获得优异的收率的2,4,5-三取代的恶唑。受保护的手性α-氨基醛参与该反应,在恶唑水解后以良好的总收率得到含去甲他汀的肽。首次研究了异腈向N,N-二苄基苯丙氨酸的亲核加成,发现是立体选择性,主要导致抗加合物(dr = 9/1)。另一方面,N -Boc苯丙醛与异腈之间的反应是非立体选择性的。