Lipase-catalyzed asymmetric synthesis of naphtho[2,3-c]furan-1(3H)-one derivatives by a one-pot dynamic kinetic resolution/intramolecular Diels–Alder reaction: Total synthesis of (−)-himbacine
(Z)-3-(phenylsulfonyl)acrylate underwent an intramolecular Diels–Alder reaction in a one-pot procedure to produce an optically active naphtho[2,3-c]furan-1(3H)-one derivative (98% ee). This method was successfully applied to the asymmetrictotalsynthesis of (−)-himbacine.
很少研究使用通过醇的酶动力学动力学拆分而安装的酰基部分的一锅顺序反应。在这项工作中,通过脂肪酶/氧钒组合催化的外消旋二烯醇[4-(cyclohex-1-en-1-yl)but-3-en-2-ol或1-( (Z)-3-(苯磺酰基)丙烯酸酯与环己基1-en-1-基)丁-2-烯-1-醇]通过一锅法进行分子内Diels-Alder反应以产生光学活性萘并[2,3 - c ]呋喃-1(3 H)-一衍生物(98%ee)。该方法已成功应用于(-)-半胱氨酸的不对称全合成。
Rapid Access to Polyprenylated Phloroglucinols via Alkylative Dearomatization−Annulation: Total Synthesis of (±)-Clusianone
作者:Ji Qi、John A. Porco
DOI:10.1021/ja0762339
日期:2007.10.1
A concise approach to the bicyclo[3.3.1]nonane framework of the polyprenylated phloroglucinol natural products utilizing a tandem alkylative dearomatization-annulation sequence is described. Syntheses of (+/-)-clusianone and a complex adamantane framework have been achieved using the developed methodology.
Regioselective Hydrosilylations of Propiolate Esters with Tris(trimethylsilyl)silane
作者:Yang Liu、Shoko Yamazaki、Shinichi Yamabe
DOI:10.1021/jo048371b
日期:2005.1.1
Lewis acid and substituent dependency on the regioselectivity of hydrosilylation of propiolate esters 1a−c with tris(trimethylsilyl)silane (2a) was found. The reaction of methyl and ethyl propiolate esters and 2a without Lewis acid and in the presence of EtAlCl2 and Et2AlCl gave β-silicon-substituted Z-alkenes 3 selectively. On the other hand, reaction in the presence of AlCl3 in dichloromethane gave