Synthesis and Stereochemistry of Some Bicyclic γ-Lactones from Parasitic Wasps (Hymenoptera: Braconidae). Utility of Hydrolytic Kinetic Resolution of Epoxides and Palladium(II)-Catalyzed Hydroxycyclization−Carbonylation−Lactonization of Ene-diols
作者:Gregory C. Paddon-Jones、Christopher S. P. McErlean、Patricia Hayes、Christopher J. Moore、Wilfried A. Konig、William Kitching
DOI:10.1021/jo0159237
日期:2001.11.1
A palladium(II)-catalyzed hydroxycyclization-carbonylation-lactonization sequence with appropriate pent-4-ene-1,3-diols provides efficient access to the bicyclic gamma-lactones, 5-n-butyl- and 5-n-hexyltetrahydrofuro-[3,2-b]furan-2(3H)-ones (3) and (4), respectively, in both racemic and enantiomeric forms. Some of the substrate pent-4-ene-1,3-diols of high enantiomeric excess (ee) have been derived
具有适当的戊-4-烯-1,3-二醇的钯(II)催化的羟基环化-羰基化-内酯化序列可有效地获得双环γ-内酯,5-正丁基和5-正己基四氢呋喃-[外消旋和对映体形式的3,2-b]呋喃-2(3H)-一(3)和(4)。一些高对映体过量(ee)的底物戊-4-烯-1,3-二醇是使用钴(III)-salen络合物通过水解动力学拆分(HKR)衍生自外消旋末端环氧化物的。(9Z,12R)-(+)-蓖麻油酸也充当其他五烯-4-烯-1,3-二醇的“手性库”来源。这些合成和对映选择性气相色谱证实了某些寄生黄蜂(膜翅目:Braconidae)中内酯的结构和绝对立体化学。高度丰富的5-n-己基四氢呋喃-[3,