Novel asymmetric phenylselenium-induced lactamizations of olefinic amides: stereoselective routes to α- and β-amino acids
作者:Sung-Kee Chung、Tae-Heum Jeong、Dong-Ho Kang
DOI:10.1039/a705390h
日期:——
Organoselenium-induced cyclofunctionalization of the (S)-N-(α,β-unsaturated) acylprolinamides 1, 7 and 14 has been found to produce the 7-membered bislactam products 2 and 15, or the 6-membered phenylselenolactam products 8 and 9 depending on the substitution pattern of the enone moiety of the starting material. The structural identities and stereochemistry of the cyclized products have been determined by X-ray diffraction, and the diastereoselectivity in the formation of the 7-membered ring bislactam product was found to be 91.6% de. The mechanism of the cyclolactamization is discussed.
有机硒诱导的(S)-N-(δ±,δ²-不饱和)酰基脯氨酰胺 1、7 和 14 的环功能化被发现可生成 7 元环双内酰胺产物 2 和 15,或 6 元环苯基硒内酰胺产物 8 和 9,这取决于起始原料的烯酮分子的取代模式。通过 X 射线衍射测定了环化产物的结构特征和立体化学性质,发现生成 7 元环双内酰胺产物的非对映选择性为 91.6%de。对环内酰胺化的机理进行了讨论。