Synthetic Studies on Sorigenins. I. Syntheses of γ-Lactones of 1-Methoxy-3-hydroxymethyl-2-naphthoic Acid and 3-Hydroxymethyl-4-methoxy-2-naphthoic Acid
Regioselective reduction of anhydrides by L-selectride
作者:Mansour A. Makhlouf、Bruce Rickborn
DOI:10.1021/jo00336a046
日期:1981.11
MAKHLOUF, M. A.;RICKBORN, B., J. ORG. CHEM., 1981, 46, N 23, 4810-4811
作者:MAKHLOUF, M. A.、RICKBORN, B.
DOI:——
日期:——
US7166631B2
申请人:——
公开号:US7166631B2
公开(公告)日:2007-01-23
Synthetic Studies on Sorigenins. I. Syntheses of γ-Lactones of 1-Methoxy-3-hydroxymethyl-2-naphthoic Acid and 3-Hydroxymethyl-4-methoxy-2-naphthoic Acid
As an exploratory experiment on syntheses of sorigenins (I), 1-methoxy-3-hydroxymethyl-2-naphthoic acid γ-lactone (VIII) and 3-hydroxymethyl-4-methoxy-2-naphthoic acid γ-lactone (XV) were synthesized. Compound (VIII) was prepared from 3-hydroxymethyl-3, 4-dihydro-1 (2H)-naphthalenone (IV) as shown in Chart 1. Compound (XV) was prepared through reduction of 3-ethoxycarbonyl-4-hydroxy-2-naphthoic acid (XVIII) and its methyl ether (XX) with lithium aluminium hydride. Reductions of 1-methoxy-2, 3-naphthalenedicarboxylic anhydride (XIV) and of the halfester prepared by alcoholysis of (XIV) with lithium aluminium hydride were found to give a mixture of (VIII) and (XV).
A regioselective facile synthesis of furo[3,4-b]carbazolones: application to the total synthesis of mafaicheenamine E and claulansine D
作者:Dipakranjan Mal、Joyeeta Roy
DOI:10.1039/c5ob00575b
日期:——
reductive cyclization to furo[3,4-b]carbazolones on reaction with LiAlH4. One of the furocarbazolones is utilized to accomplish the first totalsynthesis of claulansine D and mafaicheenamine E in 9 and 6 steps respectively. The other key steps of the syntheses are addition of an allylic indium reagent and CC double bond isomerization.
1-羟基咔唑-2,3-二羧酸酯已显示出在与LiAlH 4反应时发生化学选择性还原环化反应生成呋喃并[3,4- b ]咔唑酮。利用呋喃咔唑酮中的一种来分别完成9个步骤和6个步骤的克劳兰新D和马法拉敏E的首次全合成。合成的其他关键步骤是添加烯丙基铟试剂和CC双键异构化。