Asymmetric Synthesis of 3-Allyloxindoles and 3-Allenyloxindoles by Scandium(III)-Catalyzed Claisen Rearrangement Reactions
作者:Zeng-Wei Lai、Chuan Liu、Hongbin Sun、Shu-Li You
DOI:10.1002/cjoc.201700486
日期:2017.10
Scandium‐catalyzed asymmetric Claisenrearrangementreactions of 2‐allyloxyindoles and 2‐propargyloxyindoles provide a novel approach to diverse 3‐allyloxindoles and 3‐allenyloxindoles in excellent yields (up to 99%) and enantioselectivity (up to 99% ee) under mild reaction conditions. The scandium catalyst was derived from Sc(OTf)3 and Pybox ligand.
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.
[EN] ASYMMETRIC SYNTHESIS OF ALLYL OR ALLENE OXINDOLES<br/>[FR] SYNTHÈSE ASYMÉTRIQUE D'OXINDOLES D'ALLYLE OU D'ALLÈNE
申请人:UNIV PENNSYLVANIA
公开号:WO2010008727A1
公开(公告)日:2010-01-21
The invention concerns processes for the preparation of a compound of the formula I comprising contacting a compound of formula II with a catalyst, said catalyst comprises (i) at least one of Pd and Cu and (ii) one or more of diamine, diphosphine and aminophosphine ligands; wherein Z is -C(R5)(R6)-C(R2)=C(R3)(R4) and Y is -C(R3)(R4)-C(R2)=C(R5)(R6) or Z is -C(R5)(R6)-C≡C-R3; Y is or -C(R3)=C=C(R5)(R6); X is NH, NR15, O or S; a is O or an integer from 1 to 4 and R1 -R7 and R15 are as defined in the specification.