开发了非活化和活化烯烃与 B 2 pin 2的不对称钯催化芳基硼化/环化。范围广泛的N-烯丙基-邻碘苯甲酰胺和邻碘丙烯酰苯胺与 B 2 pin 2反应,分别以高产率和高对映选择性得到硼化 3,4-二氢异喹啉酮和羟吲哚。通过合成各种手性 3,4-二氢异喹啉酮和含有季立体碳中心的羟吲哚衍生物,包括对映体富集的罗氏抗癌剂 ( S )-RO4999200,突出了该对映选择性方案的合成效用。
An asymmetric pericyclic cascade approach to 3-alkyl-3-aryloxindoles: generality, applications and mechanistic investigations
作者:Edward Richmond、Kenneth B. Ling、Nicolas Duguet、Lois B. Manton、Nihan Çelebi-Ölçüm、Yu-Hong Lam、Sezen Alsancak、Alexandra M. Z. Slawin、K. N. Houk、Andrew D. Smith
DOI:10.1039/c4ob02526a
日期:——
The reaction of l-serine derived N-arylnitrones with alkylarylketenes generates 3-alkyl-3-aryloxindoles in good yields and excellent enantioselectivities.
The invention describes compounds of the general formula I
or the pharmaceutically acceptable salts thereof,
wherein R
1
, R
2
, R
3
and X are herein described,
a process for their manufacture, medicaments containing them as well as the use of these compounds as pharmaceutically active agents. The compounds show activity as antiproliferative agents and may be especially useful for the treatment of cancer.
The field of asymmetric catalysis has been developed by exploring noncovalent interactions, particularly within N-heterocyclic carbene-mediated processes. Despite challenges due to the limited number of compatible electrophiles (predominantly π-acceptors), this study introduces the first asymmetric α-alkylation of 3-aryl oxindoles using Csp3 electrophiles. The innovative protocol integrates diverse
不对称催化领域是通过探索非共价相互作用而发展起来的,特别是在 N-杂环卡宾介导的过程中。尽管由于相容亲电子试剂(主要是 π 受体)数量有限而面临挑战,本研究首次使用 C sp3亲电子试剂对 3-芳基羟吲哚进行不对称 α-烷基化。该创新方案集成了多种羟吲哚和烷基、烯丙基和炔丙基亲电子试剂,实现了高产率和对映选择性。初步的机理探索支持非共价催化机制,增强了构建具有潜在应用的复杂手性分子的工具包。