α-chlorovinylation: Synthesis of 2-chloropropenyl and propargyl alcohols
摘要:
Formal alpha-chlorovinylation of aldehydes using CH3CCl3/CrCl2 affords 2-chloropropenyl alcohols from which terminal propargyl alcohols are obtained via base Induced elimination. (C) 1999 Elsevier Science Ltd. All rights reserved.
Total synthesis of (−)-ribesin B and its structural revision
作者:Kae Horio、Ken-ichi Nihei
DOI:10.1016/j.tetlet.2022.154285
日期:2023.1
A highly symmetric dihydrofuran lignan, ribesin B (1), isolated from the leaves of Ribes nigrum, was synthesized via a process whereby the key step was a sequential Michael addition–carbocyclization. However, the NMR spectral features of the synthesized 1 were inconsistent with those of the natural product 1. Thus, the chemical synthesis of the isovanillin-moiety containing compound 2 from chiral propargyl
一种高度对称的二氢呋喃木酚素,ribesin B ( 1 ),从黑茶藨子的叶子中分离出来,是通过一个过程合成的,其中关键步骤是连续的迈克尔加成 - 碳环化。然而,合成的 1 的 NMR 光谱特征与天然产物1的不一致。因此,从手性炔丙醇化学合成含有异香兰素部分的化合物2是通过包括脂肪酶催化动力学拆分的过程进行的。2的 NMR 光谱与天然分离的核糖核酸 B 的核磁共振光谱完全重叠。因此,核磁共振 B 的结构被修改为2 .