[2+2]-Cycloaddition of Chlorosulfonyl Isocyanate to (Z)-Propenyl Ethers Bound to Polystyrene Resins by Alkylsulfonyl Linkers
作者:Robert Łysek、Barbara Grzeszczyk、Bartłomiej Furman、Marek Chmielewski
DOI:10.1002/ejoc.200400226
日期:2004.10
and 5-O-(Z)-propenyl ethers derived from 1,2-O-isopropylidene-α-D-xylo- and glucofuranoses, respectively, were attached to the Merrifield, MPPC and NCPSC resins using alkylsulfonyl linkers. The [2+2]-cycloaddition of chlorosulfonyl isocyanate to the polymer-bound vinyl ethers followed by the intramolecular alkylation of the β-lactam nitrogen led to the formation of mixtures of the corresponding diastereomeric
分别衍生自 1,2-O-异亚丙基-α-D-木糖和呋喃葡萄糖的 3-O- 和 5-O-(Z)-丙烯基醚使用烷基磺酰基接头连接到 Merrifield、MPPC 和 NCPSC 树脂上. 氯磺酰基异氰酸酯与聚合物结合的乙烯基醚的 [2+2]-环加成反应,然后是 β-内酰胺氮的分子内烷基化,导致形成具有低立体选择性的相应非对映异构体 oxacephams 或 clavams 的混合物。在 Merrifield 和 MPP 树脂的情况下,β-内酰胺伴随着相应的氧杂环丁烷或环氧乙烷。使用可溶性聚合物进行的反应与在溶液中进行的反应类似。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)