Palladium‐Catalyzed Umpolung Type‐II Cyclization of Allylic Carbonate‐Aldehydes Leading to 3‐Methylenecycloalkanol Derivatives
作者:Hirokazu Tsukamoto、Ayumu Kawase、Takayuki Doi
DOI:10.1002/adsc.201900450
日期:2019.8.21
umpolung type‐II cyclization of allylic carbonate‐aldehydes leading to 3‐methylenecycloalkanol derivatives was developed. The formate reductant was effective for the cyclization without causing a reduction of the η3‐allylpalladium intermediate. One‐pot decarboxylative allylation of aldehyde‐containing malonate with 2‐[(acetyloxy)methyl]‐2‐propenyl methyl carbonate followed by the cyclization of the allyl
Direct Access to 9/6‐Fused Cycles via Sequential Hydride Shift Mediated Double C(
<i>sp</i>
<sup>3</sup>
)−H Bond Functionalization
作者:Issei Nakamura、Masahiro Anada、Shunsuke Sueki、Kosho Makino、Keiji Mori
DOI:10.1002/adsc.202201354
日期:2023.2.21
We have developed a sequentialhydrideshift process involving a [1,8]-hydride shift. When cinnamylidene malonates having a biphenyl core were treated with 30 mol% Yb(OTf)3 and 10 mol% iPr2NEt, the desired sequential [1,8]-[1,5]-hydride shift process proceeded smoothly to afford synthetically challenging nine-membered carbocycle-fused piperidine derivatives in good chemical yields (up to 77%). Notably