Asymmetric Synthesis of thecis- andtrans-3,4-Dihydro-2,4,8-trihydroxynaphthalen-1(2H)-ones
作者:Emmanuel Couché、Abdellatif Fkyerat、Raffaele Tabacchi
DOI:10.1002/hlca.200390014
日期:2003.1
protocol for the asymmetric synthesis of cis- and trans-3,4-dihydro-2,4,8-trihydroxynaphthalen-1(2H)-one (1 and 2, resp.) is described, with a phthalide annulation as the key step. Introduction of a OH substituent at position 2 was performed by Sharpless dihydroxylation of a silyl enol ether or by means of an N-sulfonyloxaziridine. The absolute configuration of each isomer was determined via Mosher-ester
描述了一种短而有效的不对称合成顺式和反式-3,4-二氢-2,4,8-三羟基萘-1(2 H)-one(1和2,分别为)与邻苯二甲酸酯的方案。成环是关键步骤。通过甲硅烷基烯醇醚的无尖锐的二羟基化或借助于N-磺酰基氧氮丙啶进行在2位的OH取代基的引入。每种异构体的绝对构型通过Mosher-酯衍生物确定。通过与我们的天然样品的先前记录的CD谱比较,我们建立的天然反式-和独联体的异构体纤毛角藻 platani是(-)-(2 S,4 S)-异构体(-)- 2和(+)-(2 S,4 R)-异构体(+)- 1。