An efficient and practical preparation of optically active syn-1-vinyl-2-amino alcohol derivatives by the regio- and diastereoselective addition reaction of (γ-alkoxyallyl)titaniums with chiral imines. Formal synthesis of statine
作者:Sentaro Okamoto、Kohki Fukuhara、Fumie Sato
DOI:10.1016/s0040-4039(00)00882-0
日期:2000.7
acrolein dialkyl acetals and a divalent titanium reagent (η2-propene)Ti(O-i-Pr)2, react readily with chiral imines 2, prepared from aldehydes and optically active 1-phenylethyl amine, in a regiospecific manner to give optically active syn-1-vinyl-2-amino alcohol derivatives 3 with diastereoselectivity of more than 80% in good yield. By using the adduct 3d thus obtained, statine was formally synthesized
(γ-Alkoxyallyl)titaniums 1,由丙烯醛二烷基缩醛和二价钛试剂(η的反应而产生的2 -丙烯)的Ti(O-我-Pr)2,与手性亚胺容易反应2,从醛和光学活性的制备1-苯乙胺以区域特异性方式以良好的收率得到光学活性的非对映选择性大于80%的合成-1-乙烯基-2-氨基醇衍生物3。通过使用由此获得的加合物3d,正式合成他汀类。