Catalytic Enantioselective Meerwein−Eschenmoser Claisen Rearrangement: Asymmetric Synthesis of Allyl Oxindoles
作者:Elizabeth C. Linton、Marisa C. Kozlowski
DOI:10.1021/ja807026z
日期:2008.12.3
The first catalytic, enantioselective Meerwein-Eschenmoser Claisenrearrangement has been achieved. Palladium(II) BINAP or phosphinooxazoline catalysts were employed to generate oxindole products with 100% conversion and up to 92% ee.
第一个催化、对映选择性 Meerwein-Eschenmoser Claisen 重排已经实现。钯 (II) BINAP 或膦基恶唑啉催化剂用于生成 100% 转化率和高达 92% ee 的羟吲哚产品。
Catalytic Enantioselective Claisen Rearrangements of O-Allyl β-Ketoesters
作者:Christopher Uyeda、Andreas R. Rötheli、Eric N. Jacobsen
DOI:10.1002/anie.201005183
日期:2010.12.10
A chiral guanidinium ion is shown to catalyze enantioselective Claisenrearrangements of O‐allyl β‐ketoesters in 78–87 % ee (see scheme). The pericyclic nature of the process allows products containing vicinal stereogenic centers to be accessed with both enantio‐ and diastereocontrol.
手性胍离子在 78-87% ee 中催化O-烯丙基 β-酮酯的对映选择性克莱森重排(见方案)。该过程的周环性质允许通过对映和非对映控制访问含有邻位立体中心的产品。
Copper(II)- and Palladium(II)-Catalyzed Enantioselective Claisen Rearrangement of Allyloxy- and Propargyloxy-Indoles to Quaternary Oxindoles and Spirocyclic Lactones
作者:Trung Cao、Elizabeth C. Linton、Joshua Deitch、Simon Berritt、Marisa C. Kozlowski
DOI:10.1021/jo302039n
日期:2012.12.21
In this Article, a strategy to obtain highly enantio-selective catalysts for the Claisen rearrangement of allyloxy- and propargyloxy-indoles is outlined. Ultimately, copper BOX and palladium BINAP or PHOX catalysts were discovered as superior in catalyzing Claisen rearrangements of allyloxy- or proparyloxy-substituted indoles to generate oxindoles bearing allyl- or allenyl-substituted quaternary centers. This method proved to be tolerant of a broad range of functional groups. Tandem reactions of the silyl-allene products provide rapid access to a variety of spirocyclic oxindoles in one operation.