Multi‐Gram Scale Synthesis of Chiral 3‐Methyl‐2,5‐
<i>trans</i>
‐tetrahydrofurans
作者:Shuanglin Qin、Yuting Cao、Yunhao Luo、Shende Jiang、J. Stephen Clark、Xiaoji Wang、Guang Yang
DOI:10.1002/hlca.201900131
日期:2019.7
In this article, we report the rapid and facile synthesis of chiral 3‐methyl‐2,5‐trans‐tetrahydrofurans. This reaction utilizes cheap and easily available starting materials. A domino hydrolysis and intramolecular Michael‐type ring closure reaction was the key step. As a result, synthesis of the desired 3‐methyl‐2,5‐trans‐tetrahydrofurans could be achieved in gram‐scale over seven linear steps with
An enantioselective synthesis of the C(10) to C(20) fragment of FK506
作者:Martin E Maier、Bärbel Schöffling
DOI:10.1016/s0040-4039(00)71216-0
日期:1991.1
The synthesis of the C(10) to C(20) fragment 4 of FK506 from (4S)-4-[(tert-butyldimethylsilyl)-oxymethyl]-4-butanolide (9) is described. A key reaction is the chelation controlled addition of 2-lithio-4-methyl-furan (15b) to aldehyde 8.
A Synthetic Approach to the Fusicoccane A−B Ring Fragment Based on a Pauson−Khand Cycloaddition/Norrish Type 1 Fragmentation
作者:Gregory R. Dake、Erik E. Fenster、Brian O. Patrick
DOI:10.1021/jo800933f
日期:2008.9.1
A synthetic approach to the A-B ring system within the fusicoccane family of diterpenes is presented. Key steps in this approach are a diastereoselective Pauson-Khand reaction, a Norrish 1 photofragmentation, a Charette cyclopropanation, and a ring-closing metathesis process.