Synthesis of C2-symmetric compounds via double alkylation of (α,ω-dioxo-alkanediyl)bis-2-oxazolidinone derivatives
作者:Michael P. Trova、Yizhe Wang
DOI:10.1016/s0040-4020(01)85733-1
日期:1993.1
prepared from readily available α,ω-diacyl chlorides and optically pure 2-oxazolidinone derivatives. Following preparation of the asymmetrically pure bis-oxazolidinone derivatives (6a–d, 11, 13, and 20), we prepared the dienolate of these compounds and quenched the reaction mixture with electrophiles such as iodomethane, allyl iodide, and benzyl bromide. Compounds 14a–e, and 15 were isolated with diastereomer
由容易获得的α,ω-二酰氯和光学纯的2-恶唑烷酮衍生物制备了一系列手性C 2对称化合物。下面的制备不对称纯的双恶唑烷酮衍生物(的图6a-d ,11,13,和20),我们制备了这些化合物的二烯醇淬灭并用亲电子试剂如碘甲烷,烯丙基碘,和苄基溴反应混合物中。化合物14a-e和15的非对映异构体比例超过9.8:1。如果两个羰基原子之间的链长足够小,则不会发生二烷基化,而是提供了环化产物18,19和21。单烷基化产物22a–c由6c或6d制备,产率适中。从22b以50%的产率制备不对称的二烷基化的化合物23。