A general strategy for visible-light decaging based on the quinone <i>cis</i>-alkenyl lock
作者:David P. Walton、Dennis A. Dougherty
DOI:10.1039/c9cc01073d
日期:——
Combining the fast thermal cyclization of o-coumaric acid derivatives with the intramolecular photoreduction of quinones gives new visible-light photoremovable protecting groups absorbing well above 450 nm.
Diastereoselective Palladium-Catalyzed Arylcyanation/Heteroarylcyanation of Enantioenriched <i>N</i>-Allylcarboxamides
作者:Hyung Yoon、David A. Petrone、Mark Lautens
DOI:10.1021/ol503243a
日期:2014.12.19
dihydroisoquinolinone products are obtained in good to excellent yields with up to >95:5 dr and with full preseveration of enantioenrichment. By circumventing a difficult nucleophilic cyanation of a hindered neopentyliodide, this approach represents an improvement to the previously reported formal synthesis of (+)-corynoline.
Pd(0)-Catalyzed Dearomative Diarylation of Indoles
作者:David A. Petrone、Masaru Kondo、Nicolas Zeidan、Mark Lautens
DOI:10.1002/chem.201600118
日期:2016.4.11
We have developed a protocol for a Pd(0)‐catalyzed dearomative syn 1,2‐diarylation of indoles using readily available boroxines (dehydrated boronic acids) as coupling partners. This reaction proceeds efficiently using PtBu3 as the ligand to divergently access to fused indolines while minimizing the extent of direct Suzukicoupling. The scope of the reaction is remarkably broad and all products are
我们已经开发出了一种使用容易获得的硼氧烷(脱水硼酸)作为偶联伙伴,对吲哚进行Pd(0)催化的脱芳香基syn 1,2-二芳基化的方案。该反应使用P t Bu 3作为配体有效地进行,以发散地接近稠合的二氢吲哚,同时最小化直接铃木偶联的程度。反应的范围非常广泛,所有产物均以单一非对映异构体的形式获得,产率中等至优异。我们还编辑了一些数据,这些数据使底物和环硼氧烷的空间和电子特性与直接Suzuki偶联过程中经历所需的脱芳香性过程的倾向相平行。
Synthesis of the pentacyclic intermediate for dynemicin a and unusual formation of spiro-oxindole ring
作者:Takaaki Okita、Minoru Isobe
DOI:10.1016/s0040-4020(01)89417-5
日期:1994.1
A pentacyclic compound was synthesized as an important intermediate of antitumor antibiotic dynemicins. The key step was the intramolecular Heck reaction using catalytic Pd reagent. During the course of the synthetic studies, an unusual spiro ring compound was found to be produced via intramolecular conjugate addition.
Access to Cyclopropyl-Fused Azacycles via a Palladium-Catalyzed Direct Alkenylation Strategy
作者:Carolyn L. Ladd、André B. Charette
DOI:10.1021/acs.orglett.6b02982
日期:2016.12.2
Palladium-catalyzed directalkenylation of cyclopropyl C–H bonds proceeds in high efficiency. This transformation provides access to novel cyclopropyl-fused azacycles. Ligand studies suggest that bisphosphine monoxide analogues of dppf and rac-BINAP are the active ligand species. Preliminary results support that both BozPhos and IPrMonophos ligands can achieve high enantioinduction for this novel direct alkenylation